Bump eslint from 6.8.0 to 7.2.0

Bumps [eslint](https://github.com/eslint/eslint) from 6.8.0 to 7.2.0.
- [Release notes](https://github.com/eslint/eslint/releases)
- [Changelog](https://github.com/eslint/eslint/blob/master/CHANGELOG.md)
- [Commits](https://github.com/eslint/eslint/compare/v6.8.0...v7.2.0)

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

package.json

@@ -63,7 +63,7 @@
     "clean-css-cli": "4.3.0",
     "copy-webpack-plugin": "^6.0.1",
     "coveralls": "3.1.0",
-    "eslint": "^6.8.0",
+    "eslint": "^7.2.0",
     "eslint-config-openlayers": "^14.0.0",
     "expect.js": "0.3.1",
     "front-matter": "^4.0.0",