Update README.md

http://aboutyourstartup.com/startup-profiles/ seems to no longer exist. Their last Twitter post was in April, the submit fails and delivery fails  to their email address.
Merge pull request #17 from wallisb/patch-1

http://aboutyourstartup.com/startup-profiles/ seems to no longer exist. Their last Twitter post was in April, the submit fails and delivery fails to their email address.