Use HTTPS when downloading composer to prevent MITM attacks.

_posts/04-02-01-Composer-and-Packagist.md

@@ -12,7 +12,7 @@ There are already a lot of PHP libraries that are compatible with Composer, read
 
 You can install Composer locally (in your current working directory; though this is no longer recommended) or globally (e.g. /usr/local/bin). Let's assume you want to install Composer locally. From your project's root directory:
 
-    curl -s http://getcomposer.org/installer | php
+    curl -s https://getcomposer.org/installer | php
 
 This will download `composer.phar` (a PHP binary archive). You can run this with `php` to manage your project dependencies. <strong>Please Note:</strong> If you pipe downloaded code directly into an interpreter, please read the code online first to confirm it is safe.
 
@@ -28,7 +28,7 @@ Manually installing composer is an advanced technique; however, there are variou
 
 Since a manual installation performs none of these checks, you have to decide whether the trade-off is worth it for you. As such, below is how to obtain Composer manually:
 
-    curl -s http://getcomposer.org/composer.phar -o $HOME/local/bin/composer
+    curl -s https://getcomposer.org/composer.phar -o $HOME/local/bin/composer
     chmod +x $HOME/local/bin/composer
 
 The path `$HOME/local/bin` (or a directory of your choice) should be in your `$PATH` environment variable. This will result in a `composer` command being available.