Bump eslint from 6.8.0 to 7.2.0 (#260)

Bumps [eslint](https://github.com/eslint/eslint) from 6.8.0 to 7.2.0.
- [Release notes](https://github.com/eslint/eslint/releases)
- [Changelog](https://github.com/eslint/eslint/blob/master/CHANGELOG.md)
- [Commits](eslint/eslint@v6.8.0...v7.2.0)

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

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

package.json

@@ -48,7 +48,7 @@
     "@umijs/preset-react": "^1.4.3",
     "@umijs/plugin-block-devtool": "^1.1.1",
     "cross-env": "^7.0.0",
-    "eslint": "^6.8.0",
+    "eslint": "^7.2.0",
     "husky": "^4.0.1",
     "lint-staged": "^10.0.1",
     "mockjs": "^1.1.0",