fix(package): update yargs to version 11.0.0

Closes #61

Author: greenkeeper[bot]

package.json

@@ -30,7 +30,7 @@
     "portfinder-sync": "0.0.2",
     "selenium-webdriver": "^3.1.0",
     "which": "^1.2.12",
-    "yargs": "^8.0.1"
+    "yargs": "^11.0.0"
   },
   "devDependencies": {
     "chai": "^4.0.2",