Update CONTRIBUTING.md

Replace `Contributor Code of Conduct` to `Contributor Covenant Code of Conduct`

Author: MrVitaly

CONTRIBUTING.md

@@ -9,7 +9,7 @@ Hi there! We're thrilled that you'd like to contribute to the __GitHub Extension
 
 Contributions to this project are [released](https://help.github.com/articles/github-terms-of-service/#6-contributions-under-repository-license) to the public under the [project's open source license](LICENSE.md).
 
-Please note that this project is released with a [Contributor Code of Conduct](CODE_OF_CONDUCT.md). By participating in this project you agree to abide by its terms.
+Please note that this project is released with a [Contributor Covenant Code of Conduct](CODE_OF_CONDUCT.md). By participating in this project you agree to abide by its terms.
 
 ## Submitting a pull request