fix(package): update conf to version 6.0.0

Closes #18

Author: greenkeeper[bot]

package.json

@@ -125,7 +125,7 @@
   },
   "dependencies": {
     "chalk": "^2.3.0",
-    "conf": "^1.4.0",
+    "conf": "^6.0.0",
     "core-js": "^2.5.3",
     "get-stdin": "^5.0.1",
     "meow": "^4.0.0",