Merge pull request #130 from bigchaindb/greenkeeper/lint-staged-6.0.0

Update lint-staged to the latest version 🚀

Author: kremalicious

package.json

@@ -52,7 +52,7 @@
     "eslint-config-ascribe": "^3.0.4",
     "eslint-plugin-import": "^2.2.0",
     "husky": "^0.14.0",
-    "lint-staged": "^5.0.0",
+    "lint-staged": "^6.0.0",
     "nyc": "^11.0.2",
     "release-it": "^5.0.0",
     "rimraf": "^2.5.4",