Relaxed the selenium and chromedriver version requirements to make the demo work with the latest versions

Author: jan-molak

package.json

@@ -7,7 +7,7 @@
     "clean": "rimraf target",
     "lint": "tslint --config ./tslint.json --project ./tsconfig.json --format stylish",
     "pretest": "serenity update",
-    "pree2e": "npm run lint && npm run webdriver:update -- --standalone --versions.standalone=2.53.1 --versions.chrome=2.29",
+    "pree2e": "npm run lint && npm run webdriver:update -- --standalone",
     "e2e": "protractor ./protractor.conf.js --cucumberOpts.name 'Connie looks for the next train'",
     "report": "serenity run",
     "test": "failsafe clean e2e report",