chore(deps): update dependency electron to v4

package.json

@@ -191,7 +191,7 @@
     "css-loader": "2.0.1",
     "detect-port": "1.3.0",
     "devtron": "1.4.0",
-    "electron": "3.0.13",
+    "electron": "4.0.0",
     "electron-builder": "20.38.4",
     "electron-devtools-installer": "2.2.4",
     "enzyme": "3.8.0",

yarn.lock

@@ -5070,10 +5070,10 @@ electron-updater@^4.0.0:
     semver "^5.6.0"
     source-map-support "^0.5.9"
 
-electron@3.0.13:
-  version "3.0.13"
-  resolved "https://registry.yarnpkg.com/electron/-/electron-3.0.13.tgz#7b065a3d130c6b6379dc78d49515e03f392c1303"
-  integrity sha512-tfx5jFgXhCmpe6oPjcesaRj7geHqQxrJdbpseanRzL9BbyYUtsj0HoxwPAUvCx4+52P6XryBwWTvne/1eBVf9Q==
+electron@4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/electron/-/electron-4.0.0.tgz#6ccb40cc8bf2d49954dcea73b97ae7ad12ee04b3"
+  integrity sha512-3XPG/3IXlvnT1oe1K6zEushoD0SKbP8xwdrL10EWGe6k2iOV4hSHqJ8vWnR8yZ7VbSXmBRfomEFDNAo/q/cwKw==
   dependencies:
     "@types/node" "^8.0.24"
     electron-download "^4.1.0"