Upgrade Electron to 4.0.0

package.json

@@ -51,7 +51,7 @@
     "cross-env": "^5.2.0",
     "css-loader": "^1.0.1",
     "devtron": "^1.4.0",
-    "electron": "^3.0.10",
+    "electron": "^4.0.0",
     "electron-builder": "20.38.2",
     "electron-connect": "^0.6.3",
     "eslint": "^5.9.0",

yarn.lock

@@ -3480,10 +3480,10 @@ electron-to-chromium@^1.3.62, electron-to-chromium@^1.3.86:
   resolved "https://registry.yarnpkg.com/electron-to-chromium/-/electron-to-chromium-1.3.88.tgz#f36ab32634f49ef2b0fdc1e82e2d1cc17feb29e7"
   integrity sha512-UPV4NuQMKeUh1S0OWRvwg0PI8ASHN9kBC8yDTk1ROXLC85W5GnhTRu/MZu3Teqx3JjlQYuckuHYXSUSgtb3J+A==
 
-electron@^3.0.10:
-  version "3.0.10"
-  resolved "https://registry.yarnpkg.com/electron/-/electron-3.0.10.tgz#7d412856e8cf0d3041a612a32dd09e2af2d50f50"
-  integrity sha512-I39IeQP3NOlbjKzTDK8uK2JdiHDfhV5SruCS2Gttkn2MaKCY+yIzQ6Wr4DyBXLeTEkL1sbZxbqQVhCavAliv5w==
+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"