Cromshell update-server should provide a list of all previously connected servers

[jamesemery]

When I am working with Cromshell frequently and I have to do a lot of swapping between servers to connect with I very often find myself having to maintain a note somewhere with the list of the cormwell servers I am currently using to swap between. I would love it if there were a command along the lines of cromshell-alpha update-server --list that prints out a list of the most recent serves i have provided to the cromshell-alpha update-server command to save myself having to keep track of this information myself.