chore(deps-dev): update typescript-tslint-plugin requirement (#29)

Updates the requirements on [typescript-tslint-plugin](https://github.com/microsoft/typescript-tslint-plugin) to permit the latest version.
- [Release notes](https://github.com/microsoft/typescript-tslint-plugin/releases)
- [Changelog](https://github.com/microsoft/typescript-tslint-plugin/blob/master/CHANGELOG.md)
- [Commits](microsoft/typescript-tslint-plugin@0.3.1...0.4.0)

package.json

@@ -64,7 +64,7 @@
     "tslint": "^5.12.1",
     "tslint-ionic-rules": "0.0.21",
     "typescript": "~3.5.1",
-    "typescript-tslint-plugin": "0.3.1"
+    "typescript-tslint-plugin": "0.4.0"
   },
   "release": {
     "branch": "stable",