feat(auto-update-webdriver): Enable auto update for chromedriver and geckodriver (#48)

Author: hypery2k

cli/package.json

@@ -30,10 +30,10 @@
   },
   "preferGlobal": true,
   "dependencies": {
-    "chromedriver": "2.33.2",
+    "chromedriver": "^2.33.2",
     "fs-extra": "0.26.2",
     "galenframework": "2.3.5",
-    "geckodriver": "1.10.0",
+    "geckodriver": "^1.10.0",
     "httpreq": "0.4.13",
     "kew": "0.7.0",
     "npm-which": "3.0.1",