feature request: multi algorithm support
i have some xmrigs running, some of them might take time to update, but would be a nice feature if you could have a backup pool for older versions:

example:

Monero forks to a new variant...

1. the updated clients will connect to the latest variant pool.
2. Older versions can connect the same IP, but is proxied to an alternative pool for example another  coin with the older version of the algorithm
