bug #42 Store voters in Security (GuilhemN)

This PR was merged into the master branch.

Discussion
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Store voters in Security

[As caught by @xabbuh](https://github.com/symfony/symfony-standard/pull/1064#discussion_r114080504), in the docs, voters are stored in `Security`, not in `Voter`.

Commits
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6185425 Store voters in Security

symfony/framework-bundle/3.3/etc/packages/app.yaml

@@ -5,7 +5,7 @@ services:
         public: false
 
     App\:
-        resource: '../../src/{Command,Form,EventSubscriber,Twig,Voter}'
+        resource: '../../src/{Command,Form,EventSubscriber,Twig,Security}'
 
     App\Controller\:
         resource: '../../src/Controller'