Add useful type username command to docs/setup.md (#1606)
Add useful type username command to docs/setup.md (#1606)

Signed-off-by: Daniel P <e4249031f75e92e0c4e25946a2976fd900951984@nokernel.com>
gopasspw/gopass,franciscocpg/gopass,justwatchcom/gopass,gopasspw/gopass