build(deps-dev): bump eslint from 6.8.0 to 7.8.1

Bumps [eslint](https://github.com/eslint/eslint) from 6.8.0 to 7.8.1.
- [Release notes](https://github.com/eslint/eslint/releases)
- [Changelog](https://github.com/eslint/eslint/blob/master/CHANGELOG.md)
- [Commits](eslint/eslint@v6.8.0...v7.8.1)

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

package.json

@@ -46,7 +46,7 @@
     "browserify": "^16.0.0",
     "coveralls": "^3.0.0",
     "dot": "^1.0.3",
-    "eslint": "^6.0.0",
+    "eslint": "^7.8.1",
     "js-beautify": "^1.7.4",
     "json-schema-test": "^2.0.0",
     "karma": "^4.0.1",