Bump tsutils from 3.18.0 to 3.19.0

Bumps [tsutils](https://github.com/ajafff/tsutils) from 3.18.0 to 3.19.0.
- [Release notes](https://github.com/ajafff/tsutils/releases)
- [Changelog](https://github.com/ajafff/tsutils/blob/master/CHANGELOG.md)
- [Commits](ajafff/tsutils@v3.18.0...v3.19.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

package.json

@@ -32,7 +32,7 @@
     "tslint": "^5.11.0",
     "tslint-config-airbnb": "^5.11.1",
     "tslint-microsoft-contrib": "~6.2.0",
-    "tsutils": "~3.18.0",
+    "tsutils": "~3.19.0",
     "typedoc": "^0.16.8",
     "typedoc-plugin-shortcuts-js": "^0.1.0",
     "typescript": "~3.9.2"