chore(package): update lint-staged to version 7.1.3

Closes #270

Author: greenkeeper[bot]

package.json

@@ -67,7 +67,7 @@
     "karma-sourcemap-loader": "^0.3.7",
     "karma-spec-reporter": "^0.0.31",
     "karma-webpack": "^2.0.4",
-    "lint-staged": "^6.0.0",
+    "lint-staged": "^7.1.3",
     "material-components-web": "^0.24.0",
     "mocha": "^3.5.3",
     "mocha-css": "^1.0.1",