chore(deps): update dependency tslint to v5.12.0

Author: renovate-bot

package.json

@@ -47,7 +47,7 @@
     "semver": "5.6.0",
     "should": "13.2.3",
     "ts-loader": "5.3.1",
-    "tslint": "5.11.0",
+    "tslint": "5.12.0",
     "tslint-config-prettier": "1.17.0",
     "tslint-loader": "3.6.0",
     "typedoc": "0.13.0",