chore(package): update lint-staged to version 8.1.4

Closes #24

Author: greenkeeper[bot]

package.json

@@ -33,7 +33,7 @@
     "codecov": "^3.0.0",
     "husky": "^0.14.3",
     "jest": "^22.4.3",
-    "lint-staged": "^7.0.4",
+    "lint-staged": "^8.1.4",
     "npm-run-all": "^4.1.2",
     "prettier": "^1.12.0",
     "prop-types": "^15.6.1",