Merge pull request #89 from opensheetmusicdisplay/greenkeeper-tslint-4.0.1

Update tslint to version 4.0.1 🚀

package.json

@@ -77,7 +77,7 @@
     "mocha": "^3.0.1",
     "phantomjs-prebuilt": "^2.1.8",
     "tsify": "^1.0.2",
-    "tslint": "3.8.0",
+    "tslint": "4.0.1",
     "typedoc": "^0.4.4",
     "typescript": "^1.8.10",
     "typings": "^1.3.1"