minor #5359 Bumped version of proxy manager to stable release (peterrehm)

This PR was merged into the 2.3 branch.

Discussion
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Bumped version of proxy manager to stable release

| Q             | A
| ------------- | ---
| Doc fix?      | yes
| New docs?     | no
| Applies to    | all
| Fixed tickets | -

Commits
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69db6d5 Bumped version of proxy manager to stable release

Author: wouterj

components/dependency_injection/lazy_services.rst

@@ -39,7 +39,7 @@ the `ProxyManager bridge`_:
 
     .. code-block:: bash
 
-        $ php composer.phar require ocramius/proxy-manager:~0.5
+        $ php composer.phar require ocramius/proxy-manager:~1.0
 
     Afterwards compile your container and check to make sure that you get
     a proxy for your lazy services.