fix(e2e): fix travis e2e

See angular/webdriver-manager#121

Author: filipesilva

public/docs/_examples/package.json

@@ -76,7 +76,7 @@
     "lodash": "^4.16.2",
     "null-loader": "^0.1.1",
     "phantomjs-prebuilt": "^2.1.7",
-    "protractor": "^4.0.9",
+    "protractor": "4.0.9",
     "raw-loader": "^0.5.1",
     "rimraf": "^2.5.4",
     "rollup-plugin-commonjs": "^4.1.0",
@@ -85,6 +85,7 @@
     "ts-node": "^1.3.0",
     "tslint": "^3.15.1",
     "typescript": "^2.0.3",
+    "webdriver-manager": "10.2.5",
     "webpack": "^1.13.0",
     "webpack-dev-server": "^1.14.1",
     "webpack-merge": "^0.14.0"