Merge pull request #507 from ipfs/greenkeeper-yargs-6.0.0

Update yargs to version 6.0.0 🚀

Author: daviddias

package.json

@@ -115,7 +115,7 @@
     "temp": "^0.8.3",
     "through2": "^2.0.1",
     "update-notifier": "^1.0.2",
-    "yargs": "^5.0.0"
+    "yargs": "^6.0.0"
   },
   "contributors": [
     "Andrew de Andrade <[email protected]>",