chore(package): update protractor to version 4.0.8

https://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -48,7 +48,7 @@
     "source-map-loader": "^0.1.5",
     "istanbul-instrumenter-loader": "^0.2.0",
 
-    "protractor": "4.0.7",
+    "protractor": "4.0.8",
 
     "core-js": "^2.4.1",
     "http-server": "^0.9.0",