Fix sintaxy comment in README file

Author: vaponte7S

README.md

@@ -40,4 +40,4 @@ If you use a Telesign SDK to make your request, authentication is handled behind
 * Learn to send a request to Telesign with code with one of our [tutorials](https://developer.telesign.com/enterprise/docs/tutorials).  
 * Browse our [Developer Portal](https://developer.telesign.com) for tutorials, how-to guides, reference content, and more.
 * Check out our [sample code](https://github.com/TeleSign/sample_code) on GitHub.
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