eslint devDep updates (#28)

- eslint@4 devDep update
- in-range eslint-* devDep updates
diff --git a/package.json b/package.json
index 03eb044..f96c454 100644
--- a/package.json
+++ b/package.json
@@ -30,13 +30,13 @@
     "which": "^1.3.1"
   },
   "devDependencies": {
-    "eslint": "^3.19.0",
+    "eslint": "^4.19.1",
     "eslint-config-semistandard": "^11.0.0",
     "eslint-config-standard": "^10.2.1",
-    "eslint-plugin-import": "^2.8.0",
+    "eslint-plugin-import": "^2.13.0",
     "eslint-plugin-node": "^5.2.1",
-    "eslint-plugin-promise": "^3.6.0",
-    "eslint-plugin-standard": "^3.0.1",
+    "eslint-plugin-promise": "^3.8.0",
+    "eslint-plugin-standard": "^3.1.0",
     "file-url": "^2.0.2",
     "jasmine": "^2.4.1",
     "rewire": "^4.0.1"