[✔] Fixed typos.
Don't advise users to use :all role
Shame on me. Of course, :all is a meta role:
https://github.com/capistrano/capistrano/issues/746
Capistrano v3 _is_ on rubygems.org
Merge pull request #40 from nathanvda/patch-1

Capistrano v3 _is_ on rubygems.org
Merge pull request #38 from kirs/fix-upgrade-guide

Don't advise users to use :all role
Merge pull request #37 from mkempe/typos

Fixed typos in release announcement.
Fix release announcement typos
Merge pull request #41 from aackerman/fix-typos

Fix release announcement typos