Require Twitter Ruby Gem
If you run this script in Windows, setting PATH SSL_CERT_FILE=/Users/<user_name>/cacert.pem
Because default CA authentification file path is setted not existed folder, it is hardcoded DLL the developer user folder path. Http client gem has this bug some version.
Replace Follow with a List member.
Prepare API key on Twitter, set API key and List slug in config.yaml.