Update @typescript-eslint/eslint-plugin requirement

Updates the requirements on [@typescript-eslint/eslint-plugin](https://github.com/typescript-eslint/typescript-eslint/tree/HEAD/packages/eslint-plugin) to permit the latest version.
- [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/v2.3.1/packages/eslint-plugin)

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

package.json

@@ -58,7 +58,7 @@
     "@types/proj4": "~2.5.0",
     "@types/sinon": "~7.0.13",
     "@types/typeahead": "~0.11.32",
-    "@typescript-eslint/eslint-plugin": "~2.0.0",
+    "@typescript-eslint/eslint-plugin": "~2.3.1",
     "@typescript-eslint/parser": "~2.3.1",
     "angular": "1.7.8",
     "angular-animate": "1.7.8",