minor #4385 Don't allow deprecations in upcoming Symfony versions (javiereguiluz)
minor #4385 Don't allow deprecations in upcoming Symfony versions (javiereguiluz)

This PR was merged into the 3.0.x-dev branch.

Discussion
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Don't allow deprecations in upcoming Symfony versions

Commits
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ac64d265 Don't allow deprecations in upcoming Symfony versions

javiereguiluz/EasyAdminBundle,javiereguiluz/EasyAdminBundle