Bump @typescript-eslint/parser from 2.0.0 to 2.3.1

Bumps [@typescript-eslint/parser](https://github.com/typescript-eslint/typescript-eslint/tree/HEAD/packages/parser) from 2.0.0 to 2.3.1.
- [Release notes](https://github.com/typescript-eslint/typescript-eslint/releases)
- [Changelog](https://github.com/typescript-eslint/typescript-eslint/blob/master/packages/parser/CHANGELOG.md)
- [Commits](https://github.com/typescript-eslint/typescript-eslint/commits/v2.3.1/packages/parser)

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

package.json

@@ -69,7 +69,7 @@
     "@types/webpack": "^4.39.1",
     "@types/webpack-stream": "^3.2.10",
     "@typescript-eslint/eslint-plugin": "^2.0.0",
-    "@typescript-eslint/parser": "^2.0.0",
+    "@typescript-eslint/parser": "^2.3.1",
     "babel-loader": "^8.0.6",
     "backstopjs": "^4.1.12",
     "coveralls": "^3.0.6",