Update dependencies to electron v4 (szwacz#307)

Author: szwacz

.babelrc

@@ -9,6 +9,5 @@
         }
       }
     ]
-  ],
-  "plugins": [["transform-object-rest-spread", { "useBuiltIns": true }]]
+  ]
 }

e2e/utils.js

@@ -2,18 +2,14 @@ import electron from "electron";
 import { Application } from "spectron";
 
 const beforeEach = function() {
-  this.timeout(10000);
   this.app = new Application({
     path: electron,
-    args: ["."],
-    startTimeout: 10000,
-    waitTimeout: 10000
+    args: ["."]
   });
   return this.app.start();
 };
 
 const afterEach = function() {
-  this.timeout(10000);
   if (this.app && this.app.isRunning()) {
     return this.app.stop();
   }

package.json

@@ -34,22 +34,21 @@
     "fs-jetpack": "^2.1.0"
   },
   "devDependencies": {
-    "@babel/core": "^7.0.0-beta.54",
-    "@babel/preset-env": "^7.0.0-beta.54",
+    "@babel/core": "^7.5.5",
+    "@babel/preset-env": "^7.5.5",
     "babel-loader": "^8.0.0-beta.4",
-    "babel-plugin-transform-object-rest-spread": "^7.0.0-beta.3",
     "chai": "^4.1.0",
-    "css-loader": "^1.0.0",
-    "electron": "2.0.2",
-    "electron-builder": "^20.15.1",
-    "electron-mocha": "^6.0.4",
+    "css-loader": "^3.1.0",
+    "electron": "^4.0.0",
+    "electron-builder": "^21.1.5",
+    "electron-mocha": "^8.1.1",
     "friendly-errors-webpack-plugin": "^1.7.0",
-    "mocha": "^5.2.0",
+    "mocha": "^6.2.0",
     "source-map-support": "^0.5.6",
-    "spectron": "^3.8.0",
-    "style-loader": "^0.21.0",
-    "webpack": "^4.12.0",
-    "webpack-cli": "^3.0.4",
+    "spectron": "^6.0.0",
+    "style-loader": "^0.23.1",
+    "webpack": "^4.38.0",
+    "webpack-cli": "^3.3.6",
     "webpack-merge": "^4.1.3",
     "webpack-node-externals": "^1.7.2"
   }