use HTTPS links where appropriate

both of these links redirect to HTTPS sites, so let's just send them directly there

Author: browner12

README.md

@@ -14,12 +14,12 @@ Laravel Lumen is a stunningly fast PHP micro-framework for building web applicat
 
 ## Official Documentation
 
-Documentation for the framework can be found on the [Lumen website](http://lumen.laravel.com/docs).
+Documentation for the framework can be found on the [Lumen website](https://lumen.laravel.com/docs).
 
 ## Security Vulnerabilities
 
 If you discover a security vulnerability within Lumen, please send an e-mail to Taylor Otwell at [email protected]. All security vulnerabilities will be promptly addressed.
 
 ## License
 
-The Lumen framework is open-sourced software licensed under the [MIT license](http://opensource.org/licenses/MIT).
+The Lumen framework is open-sourced software licensed under the [MIT license](https://opensource.org/licenses/MIT).