Minor typo in README

[alanocallaghan]

Hi, sorry to be "that guy" but I spotted this omission when browsing the README.

(Formerly tasks for building RDoc, Gems and publishing to FTP were included in rake but they're now available in RDoc, RubyGems and respectively.)

[hsbt]

Where is typo in README?

[alanocallaghan]

"available in RDoc, RubyGems and respectively" suggest that a third item (for publishing to FTP) will be listed, but it isn't

[hsbt]

I welcome to pull-request. Thanks.