chore(package): update all-contributors-cli to version 6.11.2

Closes #20

Author: greenkeeper[bot]

package.json

@@ -92,7 +92,7 @@
     "@types/jest": "^22.0.0",
     "@types/meow": "^3.6.2",
     "@types/node": "^9.3.0",
-    "all-contributors-cli": "^4.10.1",
+    "all-contributors-cli": "^6.11.2",
     "colors": "^1.1.2",
     "commitizen": "^2.9.6",
     "coveralls": "^3.0.0",