`swiftmailer` version locked reduced to '~5.0'

composer.json

@@ -19,7 +19,7 @@
     ],
     "require": {
         "yiisoft/yii2": "*",
-        "swiftmailer/swiftmailer": "~5.4"
+        "swiftmailer/swiftmailer": "~5.0"
     },
     "autoload": {
         "psr-4": { "yii\\swiftmailer\\": "" }