feature #1063 Replaced SwiftMailer by Symfony Mailer (javiereguiluz)

This PR was squashed before being merged into the master branch (closes #1063).

Discussion
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Replaced SwiftMailer by Symfony Mailer

This fixes #1036.

Commits
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c5df9b7 Replaced SwiftMailer by Symfony Mailer

Author: javiereguiluz

.env

@@ -28,9 +28,6 @@ APP_SECRET=67d829bf61dc5f87a73fd814e2c9f629
 DATABASE_URL=sqlite:///%kernel.project_dir%/data/database.sqlite
 ###< doctrine/doctrine-bundle ###
 
-###> symfony/swiftmailer-bundle ###
-# For Gmail as a transport, use: "gmail://username:password@localhost"
-# For a generic SMTP server, use: "smtp://localhost:25?encryption=&auth_mode="
-# Delivery is disabled by default via "null://localhost"
-MAILER_URL=null://localhost
-###< symfony/swiftmailer-bundle ###
+###> symfony/mailer ###
+# MAILER_DSN=smtp://localhost
+###< symfony/mailer ###

composer.json

@@ -20,12 +20,12 @@
         "symfony/form": "5.0.*",
         "symfony/framework-bundle": "*",
         "symfony/intl": "5.0.*",
+        "symfony/mailer": "5.0.*",
         "symfony/monolog-bundle": "^3.1",
         "symfony/polyfill-intl-messageformatter": "^1.12",
         "symfony/polyfill-php72": "^1.8",
         "symfony/security-bundle": "5.0.*",
         "symfony/string": "5.0.*",
-        "symfony/swiftmailer-bundle": "^3.1",
         "symfony/translation": "5.0.*",
         "symfony/twig-bundle": "5.0.*",
         "symfony/validator": "5.0.*",