Fix missing -

Author: gugsrs

README.md

@@ -82,10 +82,10 @@ We encourage contribution to our projects, please see our [CONTRIBUTING](https:/
 
 Quick links:
 
-- [Feature Request](https://github.com/sendgrid/python-http-client/blob/master/CONTRIBUTING.md#feature_request)
-- [Bug Reports](https://github.com/sendgrid/python-http-client/blob/master/CONTRIBUTING.md#submit_a_bug_report)
+- [Feature Request](https://github.com/sendgrid/python-http-client/blob/master/CONTRIBUTING.md#feature-request)
+- [Bug Reports](https://github.com/sendgrid/python-http-client/blob/master/CONTRIBUTING.md#submit-a-bug-report)
 - [Sign the CLA to Create a Pull Request](https://github.com/sendgrid/python-http-client/blob/master/CONTRIBUTING.md#cla)
-- [Improvements to the Codebase](https://github.com/sendgrid/python-http-client/blob/master/CONTRIBUTING.mdimprovements_to_the_codebase)
+- [Improvements to the Codebase](https://github.com/sendgrid/python-http-client/blob/master/CONTRIBUTING.md#improvements-to-the-codebase)
 
 <a name="troubleshooting"></a>
 # Troubleshooting