Created a mutually exclusive argument group for the arguments secret and unsecret. Secret is now the default option. Moved the config file from ~/.doormanrc.yml to ~/.config/doorman.yml.
Use logging for displaying messages. Default to WARN and ERROR, option to also show INFO messages using the --verbose or -v argument.
Use appdirs to find the correct location of the configuration folder.

Mac: ~/Library/Application Support/doorman/doorman.yml
Windows: C:\\Users\\<User>\\AppData\\Local\\doorman\\doorman.yml
Linux: ~/.config/doorman/doorman.yml