build(deps-dev): bump eslint from 6.8.0 to 7.20.0 (#163)

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](https://github.com/eslint/eslint/compare/v6.8.0...v7.20.0)

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

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

package.json

@@ -42,7 +42,7 @@
     "@typescript-eslint/eslint-plugin": "^2.34.0",
     "@typescript-eslint/parser": "^4.15.0",
     "@zeit/ncc": "^0.22.3",
-    "eslint": "^6.6.0",
+    "eslint": "^7.20.0",
     "eslint-config-prettier": "^6.15.0",
     "eslint-plugin-import": "^2.22.1",
     "eslint-plugin-prettier": "^3.3.1",