Bump eslint from 7.17.0 to 7.21.0 (#119)

Bumps [eslint](https://github.com/eslint/eslint) from 7.17.0 to 7.21.0.
- [Release notes](https://github.com/eslint/eslint/releases)
- [Changelog](https://github.com/eslint/eslint/blob/master/CHANGELOG.md)
- [Commits](eslint/eslint@v7.17.0...v7.21.0)

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

package.json

@@ -32,7 +32,7 @@
     "@types/node": "^14.14.31",
     "@typescript-eslint/parser": "^4.11.1",
     "@zeit/ncc": "^0.22.3",
-    "eslint": "^7.17.0",
+    "eslint": "^7.21.0",
     "eslint-plugin-github": "^4.1.1",
     "js-yaml": "^4.0.0",
     "prettier": "2.2.1",