fix e2e test by upgrading chromedriver version

vuejs/vue-cli#2273 (comment)

Author: fritx

template/package.json

@@ -77,7 +77,7 @@
     {{/if_eq}}
     {{#e2e}}
     "babel-register": "^6.22.0",
-    "chromedriver": "^2.27.2",
+    "chromedriver": "^2.42.0",
     "cross-spawn": "^5.0.1",
     "nightwatch": "^0.9.12",
     "selenium-server": "^3.0.1",