test: update to the latest version of protractor (#4312)

Author: Brocco

packages/@angular/cli/blueprints/ng2/files/package.json

@@ -38,7 +38,7 @@
     "karma-cli": "^1.0.1",
     "karma-jasmine": "^1.0.2",
     "karma-remap-istanbul": "^0.2.1",
-    "protractor": "~4.0.13",
+    "protractor": "~5.1.0",
     "ts-node": "1.2.1",
     "tslint": "^4.3.0",
     "typescript": "~2.0.3"