Update electron-settings to version 3.0.7

Previous versions had `electron` as a dependency, and not a dev dependency. This was causing issues with code signing the application with an Apple Developer ID Application certificate.

Author: nathanbuchar

package.json

@@ -44,7 +44,7 @@
     "standard": "^8.2.0"
   },
   "dependencies": {
-    "electron-settings": "^3.0.5",
+    "electron-settings": "^3.0.7",
     "electron-shortcut-normalizer": "^1.0.0",
     "glob": "^7.1.0",
     "highlight.js": "^9.3.0"