Closure in $app->error() takes 3 arguments

see https://github.com/silexphp/Silex/blob/master/src/Silex/ExceptionListenerWrapper.php#L53
minor #1080 Closure in $app->error() takes 3 arguments (qpleple)

This PR was merged into the 2.0.x-dev branch.

Discussion
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Closure in $app->error() takes 3 arguments

see https://github.com/silexphp/Silex/blob/master/src/Silex/ExceptionListenerWrapper.php#L53

Commits
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c5528da Closure in $app->error() takes 3 arguments