fix missing links to https://symfony.com

Author: nicolas-grekas

CONTRIBUTING.md

@@ -27,7 +27,7 @@ If you'd like to contribute, please read the following documents:
 
 * [Backwards Compatibility][4]: Backward compatibility rules.
 
-[1]: http://symfony.com/doc/current/contributing/code/index.html
-[2]: http://symfony.com/doc/current/contributing/code/patches.html#check-list
-[3]: http://symfony.com/doc/current/contributing/code/patches.html#make-a-pull-request
-[4]: http://symfony.com/doc/current/contributing/code/bc.html#working-on-symfony-code
+[1]: https://symfony.com/doc/current/contributing/code/index.html
+[2]: https://symfony.com/doc/current/contributing/code/patches.html#check-list
+[3]: https://symfony.com/doc/current/contributing/code/patches.html#make-a-pull-request
+[4]: https://symfony.com/doc/current/contributing/code/bc.html#working-on-symfony-code

CONTRIBUTORS.md

@@ -2,7 +2,7 @@ CONTRIBUTORS
 ============
 
 Symfony is the result of the work of many people who made the code better
-(see http://symfony.com/contributors for more information):
+(see https://symfony.com/contributors for more information):
 
  - Fabien Potencier (fabpot)
  - Bernhard Schussek (bschussek)

composer.json

@@ -3,7 +3,7 @@
     "type": "library",
     "description": "The Symfony PHP framework",
     "keywords": ["framework"],
-    "homepage": "http://symfony.com",
+    "homepage": "https://symfony.com",
     "license": "MIT",
     "authors": [
         {
@@ -12,7 +12,7 @@
         },
         {
             "name": "Symfony Community",
-            "homepage": "http://symfony.com/contributors"
+            "homepage": "https://symfony.com/contributors"
         }
     ],
     "require": {