update according to @matthiasnoback suggestion

cordoval · cordoval · commit 1f5d8e8a9700 · 2014-04-11T08:02:12.000-05:00
diff --git a/README.md b/README.md
@@ -11,7 +11,7 @@ By Matthias Noback
 
 Using Composer:
 
-    php composer.phar require --dev matthiasnoback/symfony-service-definition-validator ~1
+    php composer.phar require matthiasnoback/symfony-service-definition-validator ~1
 
 ## Problems the validator can spot
 
