moved dev requirements to require-dev in app composer.json

fixes #1736

composer.json

@@ -17,10 +17,12 @@
 		"php": ">=5.4.0",
 		"yiisoft/yii2": "*",
 		"yiisoft/yii2-bootstrap": "*",
+		"yiisoft/yii2-swiftmailer": "*"
+	},
+	"require-dev": {
 		"yiisoft/yii2-codeception": "*",
 		"yiisoft/yii2-debug": "*",
-		"yiisoft/yii2-gii": "*",
-		"yiisoft/yii2-swiftmailer": "*"
+		"yiisoft/yii2-gii": "*"
 	},
 	"scripts": {
 		"post-create-project-cmd": [