[#4290] Re-adding version back

Author: weaverryan

components/dependency_injection/lazy_services.rst

@@ -39,7 +39,7 @@ the `ProxyManager bridge`_:
 
     .. code-block:: bash
 
-        $ php composer.phar require ocramius/proxy-manager
+        $ php composer.phar require ocramius/proxy-manager:~0.5
 
     Afterwards compile your container and check to make sure that you get
     a proxy for your lazy services.