Bump lint-staged from 6.0.0 to 8.1.5

Bumps [lint-staged](https://github.com/okonet/lint-staged) from 6.0.0 to 8.1.5.
- [Release notes](https://github.com/okonet/lint-staged/releases)
- [Commits](lint-staged/lint-staged@v6.0.0...v8.1.5)

Signed-off-by: dependabot[bot] <support@dependabot.com>

package.json

@@ -85,7 +85,7 @@
     "eslint-plugin-prettier": "^2.4.0",
     "husky": "^0.14.3",
     "jest": "^24.1.0",
-    "lint-staged": "^6.0.0",
+    "lint-staged": "^8.2.0",
     "npm-run-all": "^4.1.2",
     "prettier": "^1.11.1",
     "shx": "^0.2.2",