chore(package): update spectron to version 8.0.0

Closes #108

Author: greenkeeper[bot]

package.json

@@ -150,7 +150,7 @@
     "redux-logger": "^3.0.6",
     "sass-loader": "^6.0.6",
     "sinon": "^4.0.0",
-    "spectron": "^3.4.1",
+    "spectron": "^8.0.0",
     "style-loader": "^0.19.0",
     "ts-loader": "^3.1.0",
     "ts-node": "^4.1.0",