--only/--quiet/… option for hyp create #43

For use in shell scripts or to pipe hyp’s output into other commands, it would be practical to have an option to only get the address of the created drive/bee from hyp create. Example output, currently:

> hyp create drive
Drive Created: hyper://87f05a94b1916674fb00d4cf4da0ed3ae9d9491ebd706afbb01e2a83332f4a4e
Seeding hyperdrive

The line containing the address appears to be output via stderr, not stdout, so currently some juggling like this is required to read only the hyper://… address:

hyp create drive 2>&1 | grep -oE "hyper://\w+"

An -o/--only option (like grep) or -q/--quiet option (like many tools) that makes hyp output only the hyper://… url could be helpful.