fix(package): update lint-staged to version 8.1.5

Closes #64

Author: greenkeeper[bot]

package.json

@@ -33,7 +33,7 @@
     "jest-pnp-resolver": "1.0.2",
     "jest-resolve": "23.6.0",
     "jest": "23.6.0",
-    "lint-staged": "8.1.0",
+    "lint-staged": "8.1.5",
     "mini-css-extract-plugin": "0.4.5",
     "optimize-css-assets-webpack-plugin": "5.0.1",
     "pnp-webpack-plugin": "1.2.1",