Doesn't load the .env when the server is starting

Tried with a fresh install of yii2.
When I start the server with `php yii serve`, the .env isn't loaded.
I found this workaround: 

1. renaming the .env file to .envv
2. starting the server with `php yii serve`
3. renaming the .envv to .env

Yii2 (2.0.5)
Windows 10
PHP 7.0.4

Perhaps, I missed something in the configuration?