chore(package): update protractor to version 5.4.1

Closes #20

Author: greenkeeper[bot]

package.json

@@ -42,7 +42,7 @@
     "karma-coverage-istanbul-reporter": "^1.2.1",
     "karma-jasmine": "~1.1.0",
     "karma-jasmine-html-reporter": "^0.2.2",
-    "protractor": "~5.3.0",
+    "protractor": "~5.4.1",
     "ts-node": "~5.0.1",
     "tslint": "~5.9.1",
     "typescript": "~2.7.2"