Fix docs

ysitnikov · ysitnikov · commit 1ccb3b46ac02 · 2019-04-20T14:45:56.000+03:00
diff --git a/README.md b/README.md
@@ -3,7 +3,7 @@ Text diff library for PHP
 
 ## Installation
 ```cmd
-composer install yusitnikov/php-diff
+composer require yusitnikov/php-diff
 ```
 
 ## Usage
