Change http:// to https://

Author: TomA-R

.github/PULL_REQUEST_TEMPLATE.md

@@ -6,11 +6,11 @@ A description about what this pull request implements and its purpose. Try to be
 
 Add links to any relevant tickets and documentation.
 
-- [Link 1](http://example.com)
+- [Link 1](https://example.com)
 - ...
 
 #### Screenshots (if appropriate)
 
 Attach images or add image links here.
 
-![Example Image](http://placehold.it/300x200)
+![Example Image](https://placehold.it/300x200)

README.md

@@ -4,7 +4,7 @@ Bigcommerce API Client
 PHP client for connecting to the Bigcommerce V2 REST API.
 
 To find out more, visit the official documentation website:
-http://developer.bigcommerce.com/
+https://developer.bigcommerce.com/
 
 [![Latest Stable Version](https://poser.pugx.org/bigcommerce/api/v/stable.png)](https://packagist.org/packages/bigcommerce/api)
 [![Total Downloads](https://poser.pugx.org/bigcommerce/api/downloads.png)](https://packagist.org/packages/bigcommerce/api)