Upgrading from pre `v0.6.0`

If upgrading from a pre v0.6.0 release you will need to do the following:

Make sure you have no open bets (gun bet listshould be empty).
Make a note of how many coins you have gun -s balance.
Backup your existing gun directory by moving it from its current location.
Install the latest version of gun.
Run gun setup seed --from-existing <path-to-backup>/seed.txt
Run gun -s balance and to check your coins are there.
Delete the backup