deps: bump @typescript-eslint/eslint-plugin from 3.8.0 to 3.9.0 (#229)

Bumps [@typescript-eslint/eslint-plugin](https://github.com/typescript-eslint/typescript-eslint/tree/HEAD/packages/eslint-plugin) from 3.8.0 to 3.9.0.
- [Release notes](https://github.com/typescript-eslint/typescript-eslint/releases)
- [Changelog](https://github.com/typescript-eslint/typescript-eslint/blob/master/packages/eslint-plugin/CHANGELOG.md)
- [Commits](https://github.com/typescript-eslint/typescript-eslint/commits/v3.9.0/packages/eslint-plugin)

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

package.json

@@ -62,7 +62,7 @@
     "@types/js-yaml": "^3.12.4",
     "@types/mustache": "^4.0.1",
     "@types/node": "~12",
-    "@typescript-eslint/eslint-plugin": "^3.8.0",
+    "@typescript-eslint/eslint-plugin": "^3.9.0",
     "@typescript-eslint/parser": "^3.9.0",
     "@zeit/ncc": "^0.22.3",
     "eslint": "^7.6.0",