merged branch michelsalib/patch-2 (PR symfony#4564)

Commits
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be637b5 Add upgrade for commit 0995b1f

Discussion
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Add upgrade for UserPassword moving from Bundle to Component

Just add some documentation in the Upgrade file about the `UserPassword` moving from Bundle to Component in commit 0995b1f.

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by travisbot at 2012-06-13T01:23:49Z

This pull request [passes](http://travis-ci.org/symfony/symfony/builds/1606080) (merged be637b5 into 37550d2).

Author: fabpot

UPGRADE-2.1.md

@@ -143,6 +143,22 @@
   * `MutableAclInterface::setParentAcl` now accepts `null`, review any
     implementations of this interface to reflect this change.
 
+  * The `UserPassword` constraint has moved from the Security Bundle to the Security Component:
+    
+     Before:
+
+     ```
+     use Symfony\Bundle\SecurityBundle\Validator\Constraint\UserPassword;
+     use Symfony\Bundle\SecurityBundle\Validator\Constraint as SecurityAssert;
+     ```
+     
+     After:
+     
+     ```
+     use Symfony\Component\Security\Core\Validator\Constraint\UserPassword;
+     use Symfony\Component\Security\Core\Validator\Constraint as SecurityAssert;
+     ```
+
 ### Form
 
 #### BC Breaks in Form Types and Options