chore(deps-dev): bump eslint from 6.8.0 to 7.20.0

Bumps [eslint](https://github.com/eslint/eslint) from 6.8.0 to 7.20.0.
- [Release notes](https://github.com/eslint/eslint/releases)
- [Changelog](https://github.com/eslint/eslint/blob/master/CHANGELOG.md)
- [Commits](eslint/eslint@v6.8.0...v7.20.0)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

package.json

@@ -25,7 +25,7 @@
     "@typescript-eslint/parser": "^4.2.0",
     "chai": "^4.2.0",
     "cz-conventional-changelog": "^3.3.0",
-    "eslint": "^6.8.0",
+    "eslint": "^7.20.0",
     "eslint-config-prettier": "^6.11.0",
     "eslint-config-salesforce": "^0.1.0",
     "eslint-config-salesforce-license": "^0.1.0",