README: Update line number for patch-kexts changes

bump version to 0.2.1

README: forgot to mention that install-setvars asks for password

I forgot to mention that install-setvars.sh uses sudo to get root permissions,
so it typically asks for the user account password.

*Now* v0.2.0 is done.

update testing info; bump version to 0.1.0

bump version to 0.0.20

bump version to 0.0.19

bump version to 0.0.18

last-minute README corrections for v0.0.17

bump version to 0.0.16

bump version to 0.0.15