admins can REMOVE subscribers

Value

• remove a person who cannot remove themselves (b/c tech literacy or lost phone)

Behavior

STUB

removing

GIVEN a subscriber to a channel

• WHEN admin issues REMOVE <subscriber number>
• THEN that person is removed from channel and receives a goodby message

rejoining

GIVEN a subcriber who has been removed

• WHEN subscriber issues JOIN <channel number>
• THEN they receive a welcome message
• AND THEN they receive announcments sent by admins