update composer.json for symfony 4#16

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RedwanK wants to merge 6 commits intomasterfrom

feature/symfony-4

Commits on Mar 6, 2020

update composer.json for symfony 4
RedwanK
committed

Commits on Apr 29, 2020

feature to tests wysiwyg fields (CKEditor wysiwyg)
RedwanK
committed

Commits on Jul 31, 2020

Update phpunit and coverage version (#17)
jurv
authored

Commits on Mar 3, 2021