Upgrade test tools

package.json

@@ -42,7 +42,7 @@
     "babel-loader": "^7.0.0",
     "babel-plugin-transform-object-rest-spread": "^6.23.0",
     "babel-preset-react": "^6.24.1",
-    "chai": "^3.5.0",
+    "chai": "^4.1.2",
     "cross-env": "^5.1.3",
     "css-loader": "^0.28.1",
     "devtron": "^1.4.0",
@@ -52,10 +52,10 @@
     "electron-connect": "^0.6.1",
     "eslint": "^3.19.0",
     "eslint-plugin-react": "^7.0.0",
-    "mocha": "^3.5.3",
+    "mocha": "^5.0.0",
     "mocha-circleci-reporter": "0.0.2",
     "npm-run-all": "^4.1.2",
-    "spectron": "~3.7.2",
+    "spectron": "~3.7.3",
     "style-loader": "^0.17.0",
     "url-loader": "^0.6.2",
     "webpack": "^2.5.1",