chore(package): update protractor to version 5.4.2

Closes #106

Author: greenkeeper[bot]

package.json

@@ -79,7 +79,7 @@
     "karma-jasmine": "1.1.0",
     "karma-jasmine-html-reporter": "0.2.2",
     "karma-mocha-reporter": "2.2.3",
-    "protractor": "5.1.2",
+    "protractor": "5.4.2",
     "rimraf": "2.6.1",
     "rxjs": "^5.1.0",
     "semantic-release": "6.3.6",