Update Electon & Electron-gh-release

Electron to V 3.0.3
Electron-gh-release to V2.0.4

Author: crakoucas

package.json

@@ -15,7 +15,7 @@
     "dev": "node dev-scripts/dev.js"
   },
   "config": {
-    "electron-version": "2.0.9"
+    "electron-version": "3.0.3"
   },
   "repository": {
     "type": "git",
@@ -56,7 +56,7 @@
     "codemirror": "^5.39.0",
     "codemirror-mode-elixir": "^1.1.1",
     "electron-config": "^1.0.0",
-    "electron-gh-releases": "^2.0.2",
+    "electron-gh-releases": "^2.0.4",
     "escape-string-regexp": "^1.0.5",
     "file-uri-to-path": "^1.0.0",
     "file-url": "^2.0.2",
@@ -121,7 +121,7 @@
     "css-loader": "^0.19.0",
     "devtron": "^1.1.0",
     "dom-storage": "^2.0.2",
-    "electron": "2.0.9",
+    "electron": "3.0.3",
     "electron-packager": "^12.0.0",
     "eslint": "^3.13.1",
     "eslint-config-standard": "^6.2.1",