Merge pull request #1688 from marekdano/update-contributing-guide

Update CONTIRBUTING.md file with removing API string from the API name.

CONTRIBUTING.md

@@ -52,6 +52,7 @@ After you've created a branch on your fork with your changes, it's time to [make
 * Use a short descriptive commit message. *for e.g.*: ❌`Update Readme.md`  ✔ `Add Blockchain API to Cryptocurrency`
 * Search previous Pull Requests or Issues before making a new one, as yours may be a duplicate.
 * Don't mention the TLD(Top Level Domain) in the name of the API. *for e.g.*: ❌Gmail.com ✔Gmail
+* Please make sure the API name does not end with `API`. *for e.g.*: ❌Gmail API ✔Gmail 
 * Please make sure the API has proper documentation.
 * Please make sure you squash all commits together before opening a pull request. If your pull request requires changes upon review, please be sure to squash all additional commits as well. [This wiki page][squash-link] outlines the squash process.
 * Target your Pull Request to the `master` branch of the `public-apis`