📝 docs(README): add emoji labels

Author: kazupon

README.md

@@ -8,38 +8,38 @@ Validator component for Vue.js
 
 >:warning: NOTE: official release for Vue.js 2.0 not yet :construction:
 
-## NOTICE !!
+## :warning: NOTICE !!
 `vue-validator` have retiring from vue.js official plugins. in the future, `vue-validator` is continuing as personal project.
 
-## Compatibility
+## :ok: Compatibility
 - v2 later
     - Vue.js `1.0.20`+
 - v3 alpha (**WIP** :construction:)
     - Vue.js `2.0.3` later
 
-## Documentation
+## :book: Documentation
 - v2 later
     - See [here](http://kazupon.github.io/vue-validator/)
 - v3
     - **WIP** :construction: [here](https://kazupon.github.io/vue-validator/)
 
-## Projects
+## :star: Projects
 - v2: (maintance: https://github.com/kazupon/vue-validator/projects/1)
 - v3: (for 3.0 release: https://github.com/kazupon/vue-validator/projects/2)
 
-## Contributing
+## :muscle: Contributing
 - Fork it !
 - Create your top branch from `2.x`: `git branch my-new-topic origin/dev`
 - Commit your changes: `git commit -am 'Add some topic'`
 - Push to the branch: `git push origin my-new-topic`
 - Submit a pull request to `2.x` branch of `kazupon/vue-validator` repository !
 
-### Branch
+### :leaves: Branch
 - dev (developement branch for v3 later)
 - 2.x (maintance branch for v2 later)
 
 
-## Development Setup
+## :hammer: Development Setup
 
     # install deps
     npm install
@@ -60,21 +60,21 @@ Validator component for Vue.js
     npm test
 
 
-## Issues
+## :exclamation: Issues
 
 Please make sure to read the [Issue Reporting Checklist](https://github.com/vuejs/vue/blob/dev/.github/CONTRIBUTING.md#issue-reporting-guidelines) before opening an issue. Issues not conforming to the guidelines may be closed immediately.
 
 
-## Contribution
+## :rocket: Contribution
 
 Please make sure to read the [Contributing Guide](https://github.com/vuejs/vue/blob/dev/.github/CONTRIBUTING.md) before making a pull request.
 
 
-## Changelog
+## :scroll: Changelog
 
 Details changes for each release are documented in the [CHANGELOG.md](https://github.com/kazupon/vue-validator/blob/dev/CHANGELOG.md).
 
 
-## License
+## :copyright: License
 
 [MIT](http://opensource.org/licenses/MIT)