v0.2.0

Fixes #2

When doing Environment#refresh completely reload the cached values to
ensure we don't hit a case where the remote parameter is deleted but
there is a non-stale value in cache.

Fix a bug in env:dotenv command that printed the full array each time
because creating a closure with this.log.bind.

Refactor some flags into separate files for re-usability.

Implement var:tag for adding tags to a parameter.

Remove --tag flag from var:set command.

Remove --withEncryption flag from var:set command, it wasn't
implemented.

Fixed a typo in the README.