Merge pull request #83 from michaellenahan/patch-5

Typo

Author: AydinHassan

exercises/dependency-heaven/problem/problem.md

@@ -39,7 +39,7 @@ You will also be required to use `danielstjules/stringy` to manipulate the data
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 ## HINTS
 
-Point your browser to [https://getcomposer.org/doc/00-intro.md](https://getcomposer.org/doc/00-intro.md) which will walk you through **Installing Composer** if you havn't already!
+Point your browser to [https://getcomposer.org/doc/00-intro.md](https://getcomposer.org/doc/00-intro.md) which will walk you through **Installing Composer** if you haven't already!
 
 Use `composer init` to create your `composer.json` file with interactive search. 
 
@@ -54,4 +54,4 @@ Oh, and don't forget to use the Composer autoloader with:
 ```php
 require_once __DIR__ . '/vendor/autoload.php';
 ```
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