Lock tslint version due to a bug in 4.2.0

Author: cvle

package.json

@@ -91,7 +91,7 @@
     "remap-istanbul": "0.8.0",
     "sinon": "^2.0.0-pre.4",
     "ts-node": "~1.2.3",
-    "tslint": "^4.1.1",
+    "tslint": "~4.1.1",
     "typescript": "^2.1.4",
     "webpack": "^2.2.0-rc.1"
   }