old_contents: CURRENT_MIN_VERSION = 'v3.0'
  CURRENT_MAX_VERSION = 'v3.1'
  
  ACTIVE_REMOTE_BRANCHES = ['master', 'staging', 'demo']
  DEFAULT_COMMAND_TIMEOUT = 60 * 60
  
  CONTROLLER_PROTOCOL = 'controller'
  PROTOCOLS = {'udp', 'tcp', 'ssh', 'http', 'ws', CONTROLLER_PROTOCOL}
  CRP_TYPES = {'docker', 'gce', 'static'}
  
new_contents: CURRENT_MIN_VERSION = 'v3.0'
  CURRENT_MAX_VERSION = 'v3.1'
  
  # Once the Next platform supports challenge versions this can be extended.
  ACTIVE_REMOTE_BRANCHES = ['master']
  DEFAULT_COMMAND_TIMEOUT = 60 * 60
  
  CONTROLLER_PROTOCOL = 'controller'
  PROTOCOLS = {'udp', 'tcp', 'ssh', 'http', 'ws', CONTROLLER_PROTOCOL}
  CRP_TYPES = {'docker', 'gce', 'static'}
  
subject: Change v3 active branches to [master]