Update eslint requirement from ^7.19.0 to ^7.20.0 (#119)

Updates the requirements on [eslint](https://github.com/eslint/eslint) to permit the latest version.
- [Release notes](https://github.com/eslint/eslint/releases)
- [Changelog](https://github.com/eslint/eslint/blob/master/CHANGELOG.md)
- [Commits](eslint/eslint@v7.19.0...v7.20.0)

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

package.json

@@ -23,7 +23,7 @@
   "devDependencies": {
     "@wearerequired/eslint-config": "file:packages/eslint-config",
     "@wordpress/eslint-plugin": "^8.0.2",
-    "eslint": "^7.19.0",
+    "eslint": "^7.20.0",
     "lerna": "^3.22.1"
   },
   "scripts": {