docs(contributing): added the semantic-release badge

for #27

CONTRIBUTING.md

@@ -33,6 +33,7 @@ pull-request to a project, [this tutorial][PRs-link] can help get you started.
 ### Commit Convention
 
 [![Conventional Commits][commit-convention-badge]][commit-convention-link]
+[![semantic-release][semantic-release-badge]][semantic-release-link]
 
 We publish our pacakages automatically using
 [semantic-release](https://github.com/semantic-release/semantic-release/).
@@ -86,6 +87,8 @@ configured versions when changing into a directory.
 
 [commit-convention-link]: https://conventionalcommits.org
 [commit-convention-badge]: https://img.shields.io/badge/Conventional%20Commits-1.0.0-yellow.svg
+[semantic-release-link]: https://github.com/semantic-release/semantic-release
+[semantic-release-badge]: https://img.shields.io/badge/%20%20%F0%9F%93%A6%F0%9F%9A%80-semantic--release-e10079.svg
 [commitizen-link]: http://commitizen.github.io/cz-cli/
 [commitizen-badge]: https://img.shields.io/badge/commitizen-friendly-brightgreen.svg
 [PRs-link]: http://makeapullrequest.com