Updated to conform to SendGrid's new Open Source policies

Author: thinkingserious

README.md

@@ -77,10 +77,10 @@ We encourage contribution to our libraries, please see our [CONTRIBUTING](https:
 
 Quick links:
 
-- [Feature Request](https://github.com/sendgrid/php-http-client/blob/master/CONTRIBUTING.md)#feature_request)
-- [Bug Reports](https://github.com/sendgrid/php-http-client/blob/master/CONTRIBUTING.md)#submit_a_bug_report)
-- [Sign the CLA to Create a Pull Request](https://github.com/sendgrid/php-http-client/blob/master/CONTRIBUTING.md)#cla)
-- [Improvements to the Codebase](https://github.com/sendgrid/php-http-client/blob/master/CONTRIBUTING.md)#improvements_to_the_codebase)
+- [Feature Request](https://github.com/sendgrid/php-http-client/blob/master/CONTRIBUTING.md#feature_request)
+- [Bug Reports](https://github.com/sendgrid/php-http-client/blob/master/CONTRIBUTING.md#submit_a_bug_report)
+- [Sign the CLA to Create a Pull Request](https://github.com/sendgrid/php-http-client/blob/master/CONTRIBUTING.md#cla)
+- [Improvements to the Codebase](https://github.com/sendgrid/php-http-client/blob/master/CONTRIBUTING.md#improvements_to_the_codebase)
 
 # Thanks