chore: bump production dependencies (#73)

* fs-extra@^8.1.0
* npm-package-arg@^6.1.1
* resolve@^1.12.0
* semver@^6.3.0
diff --git a/package.json b/package.json
index b4c64c3..f6552bc 100644
--- a/package.json
+++ b/package.json
@@ -22,11 +22,11 @@
   },
   "dependencies": {
     "cordova-common": "^3.1.0",
-    "fs-extra": "^7.0.1",
-    "npm-package-arg": "^6.1.0",
+    "fs-extra": "^8.1.0",
+    "npm-package-arg": "^6.1.1",
     "pify": "^4.0.1",
-    "resolve": "^1.10.0",
-    "semver": "^5.6.0",
+    "resolve": "^1.12.0",
+    "semver": "^6.3.0",
     "which": "^1.3.1"
   },
   "devDependencies": {