Fix invalid reference to visualizeRevTree

We can now reference this directly from npm instead of resolving
from GitHub. The reference to GitHub was incorrect (referenced
non-existent gh-pages tag) which resulted in a resolution error
in the latest npm.
diff --git a/app/addons/documents/rev-browser/actions.js b/app/addons/documents/rev-browser/actions.js
index 6b56a74..e1cf443 100644
--- a/app/addons/documents/rev-browser/actions.js
+++ b/app/addons/documents/rev-browser/actions.js
@@ -13,7 +13,7 @@
 import FauxtonAPI from "../../../core/api";
 import {post} from "../../../core/ajax";
 import ActionTypes from "./actiontypes";
-import getTree from "visualizeRevTree/lib/getTree";
+import getTree from "visualize-rev-tree/lib/getTree";
 import PouchDB from "pouchdb-core";
 import PouchHttpAdapter from 'pouchdb-adapter-http';
 PouchDB.plugin(PouchHttpAdapter);
diff --git a/package-lock.json b/package-lock.json
index 73ed1cc..8e0dcc3 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -6451,7 +6451,8 @@
         },
         "ansi-regex": {
           "version": "2.1.1",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "aproba": {
           "version": "1.2.0",
@@ -6469,11 +6470,13 @@
         },
         "balanced-match": {
           "version": "1.0.0",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "brace-expansion": {
           "version": "1.1.11",
           "bundled": true,
+          "optional": true,
           "requires": {
             "balanced-match": "^1.0.0",
             "concat-map": "0.0.1"
@@ -6486,15 +6489,18 @@
         },
         "code-point-at": {
           "version": "1.1.0",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "concat-map": {
           "version": "0.0.1",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "console-control-strings": {
           "version": "1.1.0",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "core-util-is": {
           "version": "1.0.2",
@@ -6597,7 +6603,8 @@
         },
         "inherits": {
           "version": "2.0.3",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "ini": {
           "version": "1.3.5",
@@ -6607,6 +6614,7 @@
         "is-fullwidth-code-point": {
           "version": "1.0.0",
           "bundled": true,
+          "optional": true,
           "requires": {
             "number-is-nan": "^1.0.0"
           }
@@ -6619,17 +6627,20 @@
         "minimatch": {
           "version": "3.0.4",
           "bundled": true,
+          "optional": true,
           "requires": {
             "brace-expansion": "^1.1.7"
           }
         },
         "minimist": {
           "version": "0.0.8",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "minipass": {
           "version": "2.3.5",
           "bundled": true,
+          "optional": true,
           "requires": {
             "safe-buffer": "^5.1.2",
             "yallist": "^3.0.0"
@@ -6646,6 +6657,7 @@
         "mkdirp": {
           "version": "0.5.1",
           "bundled": true,
+          "optional": true,
           "requires": {
             "minimist": "0.0.8"
           }
@@ -6718,7 +6730,8 @@
         },
         "number-is-nan": {
           "version": "1.0.1",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "object-assign": {
           "version": "4.1.1",
@@ -6728,6 +6741,7 @@
         "once": {
           "version": "1.4.0",
           "bundled": true,
+          "optional": true,
           "requires": {
             "wrappy": "1"
           }
@@ -6803,7 +6817,8 @@
         },
         "safe-buffer": {
           "version": "5.1.2",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "safer-buffer": {
           "version": "2.1.2",
@@ -6833,6 +6848,7 @@
         "string-width": {
           "version": "1.0.2",
           "bundled": true,
+          "optional": true,
           "requires": {
             "code-point-at": "^1.0.0",
             "is-fullwidth-code-point": "^1.0.0",
@@ -6850,6 +6866,7 @@
         "strip-ansi": {
           "version": "3.0.1",
           "bundled": true,
+          "optional": true,
           "requires": {
             "ansi-regex": "^2.0.0"
           }
@@ -6888,11 +6905,13 @@
         },
         "wrappy": {
           "version": "1.0.2",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "yallist": {
           "version": "3.0.3",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         }
       }
     },
@@ -8395,6 +8414,7 @@
             "align-text": {
               "version": "0.1.4",
               "bundled": true,
+              "optional": true,
               "requires": {
                 "kind-of": "^3.0.2",
                 "longest": "^1.0.1",
@@ -9097,7 +9117,8 @@
             },
             "longest": {
               "version": "1.0.1",
-              "bundled": true
+              "bundled": true,
+              "optional": true
             },
             "loose-envify": {
               "version": "1.3.1",
@@ -9873,7 +9894,8 @@
         "safe-buffer": {
           "version": "5.1.1",
           "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.1.1.tgz",
-          "integrity": "sha512-kKvNJn6Mm93gAczWVJg7wH+wGYWNrDHdWvpUmHyEsgCtIwwo3bqPtV4tR5tuPaUhTOo/kvhVwd8XwwOllGYkbg=="
+          "integrity": "sha512-kKvNJn6Mm93gAczWVJg7wH+wGYWNrDHdWvpUmHyEsgCtIwwo3bqPtV4tR5tuPaUhTOo/kvhVwd8XwwOllGYkbg==",
+          "optional": true
         },
         "semver": {
           "version": "1.0.14",
@@ -12342,7 +12364,8 @@
             "ansi-regex": {
               "version": "2.1.1",
               "bundled": true,
-              "dev": true
+              "dev": true,
+              "optional": true
             },
             "aproba": {
               "version": "1.2.0",
@@ -12363,12 +12386,14 @@
             "balanced-match": {
               "version": "1.0.0",
               "bundled": true,
-              "dev": true
+              "dev": true,
+              "optional": true
             },
             "brace-expansion": {
               "version": "1.1.11",
               "bundled": true,
               "dev": true,
+              "optional": true,
               "requires": {
                 "balanced-match": "^1.0.0",
                 "concat-map": "0.0.1"
@@ -12383,17 +12408,20 @@
             "code-point-at": {
               "version": "1.1.0",
               "bundled": true,
-              "dev": true
+              "dev": true,
+              "optional": true
             },
             "concat-map": {
               "version": "0.0.1",
               "bundled": true,
-              "dev": true
+              "dev": true,
+              "optional": true
             },
             "console-control-strings": {
               "version": "1.1.0",
               "bundled": true,
-              "dev": true
+              "dev": true,
+              "optional": true
             },
             "core-util-is": {
               "version": "1.0.2",
@@ -12510,7 +12538,8 @@
             "inherits": {
               "version": "2.0.3",
               "bundled": true,
-              "dev": true
+              "dev": true,
+              "optional": true
             },
             "ini": {
               "version": "1.3.5",
@@ -12522,6 +12551,7 @@
               "version": "1.0.0",
               "bundled": true,
               "dev": true,
+              "optional": true,
               "requires": {
                 "number-is-nan": "^1.0.0"
               }
@@ -12536,6 +12566,7 @@
               "version": "3.0.4",
               "bundled": true,
               "dev": true,
+              "optional": true,
               "requires": {
                 "brace-expansion": "^1.1.7"
               }
@@ -12543,12 +12574,14 @@
             "minimist": {
               "version": "0.0.8",
               "bundled": true,
-              "dev": true
+              "dev": true,
+              "optional": true
             },
             "minipass": {
               "version": "2.3.5",
               "bundled": true,
               "dev": true,
+              "optional": true,
               "requires": {
                 "safe-buffer": "^5.1.2",
                 "yallist": "^3.0.0"
@@ -12567,6 +12600,7 @@
               "version": "0.5.1",
               "bundled": true,
               "dev": true,
+              "optional": true,
               "requires": {
                 "minimist": "0.0.8"
               }
@@ -12647,7 +12681,8 @@
             "number-is-nan": {
               "version": "1.0.1",
               "bundled": true,
-              "dev": true
+              "dev": true,
+              "optional": true
             },
             "object-assign": {
               "version": "4.1.1",
@@ -12659,6 +12694,7 @@
               "version": "1.4.0",
               "bundled": true,
               "dev": true,
+              "optional": true,
               "requires": {
                 "wrappy": "1"
               }
@@ -12744,7 +12780,8 @@
             "safe-buffer": {
               "version": "5.1.2",
               "bundled": true,
-              "dev": true
+              "dev": true,
+              "optional": true
             },
             "safer-buffer": {
               "version": "2.1.2",
@@ -12780,6 +12817,7 @@
               "version": "1.0.2",
               "bundled": true,
               "dev": true,
+              "optional": true,
               "requires": {
                 "code-point-at": "^1.0.0",
                 "is-fullwidth-code-point": "^1.0.0",
@@ -12799,6 +12837,7 @@
               "version": "3.0.1",
               "bundled": true,
               "dev": true,
+              "optional": true,
               "requires": {
                 "ansi-regex": "^2.0.0"
               }
@@ -12842,12 +12881,14 @@
             "wrappy": {
               "version": "1.0.2",
               "bundled": true,
-              "dev": true
+              "dev": true,
+              "optional": true
             },
             "yallist": {
               "version": "3.0.3",
               "bundled": true,
-              "dev": true
+              "dev": true,
+              "optional": true
             }
           }
         },
@@ -18946,9 +18987,10 @@
         "extsprintf": "^1.2.0"
       }
     },
-    "visualizeRevTree": {
-      "version": "git+https://github.com/neojski/visualizeRevTree.git#e90e372f381508c9d2c305bd74b84a032005c77d",
-      "from": "git+https://github.com/neojski/visualizeRevTree.git#gh-pages"
+    "visualize-rev-tree": {
+      "version": "0.0.1",
+      "resolved": "https://registry.npmjs.org/visualize-rev-tree/-/visualize-rev-tree-0.0.1.tgz",
+      "integrity": "sha512-FWGun8R+BCINc7GBAWS8cEu9Nry40ZH3mM8XGgsqMFNJ0nFzeF9YecesK45EO5Pwgt8rBntdTdZfCV/JS1gjVw=="
     },
     "vm-browserify": {
       "version": "1.1.0",
diff --git a/package.json b/package.json
index 29bb9e4..35fef8a 100644
--- a/package.json
+++ b/package.json
@@ -104,7 +104,7 @@
     "url-loader": "^2.0.1",
     "urls": "~0.0.3",
     "uuid": "^3.0.1",
-    "visualizeRevTree": "git+https://github.com/neojski/visualizeRevTree.git#gh-pages",
+    "visualize-rev-tree": "0.0.1",
     "webpack": "^4.41.0",
     "webpack-cli": "^3.3.9",
     "webpack-dev-server": "^3.8.2",