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

Closes #28

Author: greenkeeper[bot]

package.json

@@ -47,7 +47,7 @@
     "gh-pages": "^1.0.0",
     "husky": "^0.14.1",
     "jest": "^21.2.1",
-    "lint-staged": "^4.0.0",
+    "lint-staged": "^7.0.0",
     "semantic-release": "^6.3.6",
     "ts-jest": "^21.1.2",
     "tslint": "^5.0.0",