Bump eslint from 4.18.1 to 4.19.1

Bumps [eslint](https://github.com/eslint/eslint) from 4.18.1 to 4.19.1.
- [Release notes](https://github.com/eslint/eslint/releases)
- [Changelog](https://github.com/eslint/eslint/blob/master/CHANGELOG.md)
- [Commits](eslint/eslint@v4.18.1...v4.19.1)

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

package.json

@@ -2,7 +2,7 @@
   "name": "offlinetube",
   "version": "0.0.0",
   "devDependencies": {
-    "eslint": "4.18.1",
+    "eslint": "4.19.1",
     "grunt": "1.0.2",
     "grunt-contrib-clean": "1.1.0",
     "grunt-contrib-connect": "1.0.2",