Update dependencies (Codeception#149)

Co-authored-by: TavoNiievez <ganieves@outlook.com>

Update minimum version of PHP

Added assertions for Symfony Mime component (Codeception#139)

Added logout by path (Codeception#134)

Added Symfony 5.3 support (Codeception#133)

Fix Doctrine Connection service alias (Codeception#129)

Mentioning Symfony Mailer requirement in v2.0.0 (Codeception#126)

Better explain orphan events (Codeception#116)

Added seeFormErrorMessages function (Codeception#67)

Update code standards to PHP 7.1+ (Codeception#75)