Update README.md

[banduki]

Typo in subheading

[teor2345]

Thanks @banduki , but I think this bug has already been fixed in the latest gettor version at:
https://github.com/torproject/gettor/blob/master/README.md

@cohosh do you want to archive this copy of gettor, and point to the actively maintained version?
(We might want to do that for a lot of TheTorProject repositories.)

[cohosh]

Oh wow, thanks for the headsup. I didn't know this repo existed.