bug #684 Fix invalid app.json (yceruto)

This PR was merged into the master branch.

Discussion
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Fix invalid app.json

fixes #682

Commits
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33f0df8 Fix invalid app.json

Author: javiereguiluz

app.json

@@ -21,7 +21,7 @@
         },
         "APP_DEBUG": {
             "value": "0"
-        }
+        },
         "SYMFONY_LOG": "php://stderr",
         "APP_SECRET": {
             "description": "Extra entropy for %kernel.secret%; used for CSRF tokens, cookies and signed URLs.",