chore(package): update lint-staged to version 7.0.2

Closes #94

Author: greenkeeper[bot]

package.json

@@ -31,7 +31,7 @@
     "eslint-plugin-standard": "^3.0.1",
     "faker": "^4.1.0",
     "husky": "^0.14.3",
-    "lint-staged": "^6.1.0",
+    "lint-staged": "^7.0.2",
     "prettier": "^1.10.2",
     "solhint": "^1.1.10",
     "solidity-coverage": "^0.4.9"