Safe

This release adds the --safe flag that lets you provide a dotenv file with all the keys your program needs to run. If there are keys provided to --safe that's not in the combination of your other files it will raise an error with the missing keys.

0.2.1

Fix command line parsing by using Cmdliner proper and also flesh out the man page a bit.

0.2.0

Add cmdliner to make the CLI more like dotenv-cli and allow for multiple dotenv files.

Changed the internal representation of the environment to a Hashtbl, partly to not add multiple of the same environment variable and to let files added later to overwrite the first.