Bump eslint from 6.8.0 to 7.31.0

Bumps [eslint](https://github.com/eslint/eslint) from 6.8.0 to 7.31.0.
- [Release notes](https://github.com/eslint/eslint/releases)
- [Changelog](https://github.com/eslint/eslint/blob/master/CHANGELOG.md)
- [Commits](eslint/eslint@v6.8.0...v7.31.0)

---
updated-dependencies:
- dependency-name: eslint
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

package.json

@@ -41,7 +41,7 @@
   "license": "MIT",
   "devDependencies": {
     "browserstack-runner": "^0.9.0",
-    "eslint": "^6.8.0",
+    "eslint": "^7.31.0",
     "eslint-config-standard": "^14.1.0",
     "eslint-plugin-promise": "^4.2.1",
     "eslint-plugin-html": "^6.0.0",