chore(package): update chromedriver to version 2.28.0 (#1386)

https://greenkeeper.io/

Author: greenkeeper[bot]

package.json

@@ -95,7 +95,7 @@
     "babel-preset-es2015": "6.22.0",
     "benchmark": "2.1.3",
     "cheerio": "0.22.0",
-    "chromedriver": "2.26.1",
+    "chromedriver": "2.28.0",
     "coveralls": "2.11.16",
     "cross-env": "3.1.4",
     "fly": "2.0.5",