chore(package): update lint-staged to version 8.1.0

Closes #49

Author: greenkeeper[bot]

package.json

@@ -108,7 +108,7 @@
     "html-webpack-template": "^6.2.0",
     "husky": "^0.14.0",
     "jest": "^22.4.3",
-    "lint-staged": "^7.1.0",
+    "lint-staged": "^8.1.0",
     "lodash.camelcase": "^4.3.0",
     "material-design-icons": "^3.0.1",
     "node-sass": "^4.9.0",