Merge pull request #93 from opensheetmusicdisplay/greenkeeper-grunt-tslint-4.0.0

Update grunt-tslint to version 4.0.0 🚀

package.json

@@ -61,7 +61,7 @@
     "grunt-http-server": "",
     "grunt-karma": "^2.0.0",
     "grunt-ts": "^6.0.0-beta.3",
-    "grunt-tslint": "^3.1.1",
+    "grunt-tslint": "^4.0.0",
     "grunt-typedoc": "^0.2.4",
     "grunt-typings": "^0.1.5",
     "http-server": "",