Bump eslint from 6.8.0 to 7.5.0

Bumps [eslint](https://github.com/eslint/eslint) from 6.8.0 to 7.5.0.
- [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...v7.5.0)

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

package.json

@@ -53,7 +53,7 @@
     "@babel/preset-env": "^7.4.5",
     "autoprefixer": "^9.5.1",
     "cssnano": "^4.1.10",
-    "eslint": "^6.0.0",
+    "eslint": "^7.5.0",
     "eslint-config-airbnb-base": "^14.0.0",
     "eslint-plugin-import": "^2.17.3",
     "gulp": "^4.0.2",