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

Closes #95

Author: greenkeeper[bot]

package.json

@@ -98,7 +98,7 @@
     "git-prepush-hook": "^1.0.2",
     "jest": "^22.4.2",
     "json-loader": "^0.5.4",
-    "lint-staged": "^7.0.0",
+    "lint-staged": "^8.1.4",
     "opn-cli": "^3.1.0",
     "pre-commit": "^1.2.2",
     "purecss": "^1.0.0",