v0.2.1

Update enve command (#3)

v0.2.0: Add enve cli, tuple support and custom error (#2)

* Added a new Sentinel class to define the UNSET sentinel value.
* Added the enve CLI script.
* Added support for parsing envvars into tuples.
* Added a custom EnvError exception class inheriting from KeyError and ValueError.

v0.1.0

Add link to docs