chore(package): update @types/selenium-webdriver to version 4.0.4

Closes #235

Author: greenkeeper[bot]

package.json

@@ -89,7 +89,7 @@
     "@types/hammerjs": "^2.0.33",
     "@types/jest": "^21.1.0",
     "@types/node": "^8.0.28",
-    "@types/selenium-webdriver": "^3.0.6",
+    "@types/selenium-webdriver": "^4.0.4",
     "@types/source-map": "^0.5.0",
     "@types/uglify-js": "^2.6.29",
     "angular2-template-loader": "^0.6.0",