README.md: Fixed composer install declaration.

ThomasNunninger · ThomasNunninger · commit 57400fdcf0d0 · 2019-03-05T14:14:30.000+01:00
diff --git a/README.md b/README.md
@@ -13,7 +13,7 @@ The concept how to extend the base class was inspired by [beberlei/assert].
 Use [Composer] to install this library:
 
 ```
-$ composer require scaleupventures/assert
+$ composer require scaleupstack/assert
 ```
 
 
