chore(package): update lesshint to version 5.0.2

Closes #17

Author: greenkeeper[bot]

package.json

@@ -31,7 +31,7 @@
     "csscomb": "^4.0.0",
     "gulp-google-webfonts": "^0.0.14",
     "less": "^2.7.2",
-    "lesshint": "^4.0.0",
+    "lesshint": "^5.0.2",
     "npm-run-all": "^4.0.0",
     "rimraf": "^2.5.4"
   }