chore(package): update jshint to version 2.9.7

Author: greenkeeper[bot]

package.json

@@ -47,7 +47,7 @@
     "chai-as-promised": "^6.0.0",
     "gofur": "^1.1.0",
     "istanbul": "^0.4.5",
-    "jshint": "^2.9.4",
+    "jshint": "^2.9.7",
     "mocha": "^5.0.4",
     "request": "^2.85.0"
   },