Fix composer require installation instruction.

cjsaylor · cjsaylor · commit 933117f90bca · 2016-02-29T14:14:25.000-05:00
diff --git a/README.md b/README.md
@@ -21,7 +21,7 @@ In many cases, rebuilding an index requires a clean slate so that the entire ind
 ## Installation
 
 ```
-composer require zumba\elasticsearch-index-rotator
+composer require zumba/elasticsearch-index-rotate
 ```
 
 ## Usage
