simplify installation instructions based on Will's comment

Author: NicolasCARPi

docs/getting-started.md

@@ -7,18 +7,10 @@ title: Getting Started
 
 The best way of making use of this project is by installing it with [composer](https://getcomposer.org/doc/01-basic-usage.md).
 
-```
-php composer.phar require robthree/twofactorauth
-```
-
-or if you have composer installed globally
-
 ```
 composer require robthree/twofactorauth
 ```
 
-**Note:** If you are not using a composer-aware framework, you should [include the composer loader yourself](https://getcomposer.org/doc/01-basic-usage.md#autoloading).
-
 ## 2. Create an instance
 
 `TwoFactorAuth` constructor requires an object able to provide a QR Code image. It is the only mandatory argument. This lets you select your preferred QR Code generator/library.