💥 — Default app env is now prod (fix #47)

@almet My solution to #47 (closed) was to set the app env to prod by default (which makes sense, as more people should use Argos than developing on it).

I try to set ARGOS_APP_ENV=dev in my .env file, at the root of my repository but Argos tried to use the prod env.

Do you know if there is a way to force Argos to read the .env file before selecting the environment?