chore(package): update lint-staged to version 7.0.0

Author: greenkeeper[bot]

package.json

@@ -39,7 +39,7 @@
     "eslint-plugin-import": "^2.8.0",
     "husky": "^0.14.3",
     "jest": "^22.0.4",
-    "lint-staged": "^6.0.0",
+    "lint-staged": "^7.0.0",
     "prettier": "^1.9.2",
     "projectz": "^1.4.0",
     "semantic-release": "^12.2.2",