Added chromedriver dependency.

package.json

@@ -15,7 +15,8 @@
     "jsdoc": "^3.4.0",
     "selenium-webdriver": "^3.3.0",
     "mocha": "^3.2.0",
-    "should": "^11.2.1"
+    "should": "^11.2.1",
+    "chromedriver": "latest"
   },
   "scripts": {
     "test": "mocha tests/selenium/test*.js"