0.1.0

• Load croud commands from a croud_commands entry points
  section.

• Added a tabular format to the list of possible output formats in subcommands.

• Added subcommand me that allows to print info about the current
  logged-in user.

• Added subcommand login that allows to login to https://cratedb.cloud
  using OAuth. It will open a browser to start the authentication process.

• Added a subcommand logout that clears the stored login token, and clears the
  OAuth session

• The environment used to logged to in is now stored in config, so it is only
  necessary to provide the --env flag on the login subcommand