[mailgun-mailer] support EU-endpoint#31897

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bullder wants to merge 3 commits intosymfony:4.4from

bullder:mailgun-mailer-region

Commits on Jun 6, 2019

[mailgun-mailer] support EU-endpoint
Michael Garifullin
committed
[mailgun-mailer] support EU-endpoint. Final to MailgunRegionConfiguration and throw exception in constuctors
bullder
committed

Commits on Jun 7, 2019

[mailgun-mailer] support EU-endpoint. Small improvements for mailgun transport default region
Michael Garifullin
committed