Updated the 1.4.0dev12 release notes (#4862)
Updated the 1.4.0dev12 release notes (#4862)

* Updated the 1.4.0dev12 release notes

Some changes landed to unblock the release, so updating the notes.
There was never any packages published under this version, the
release cut from the coming tag will be the sole 1.4.0dev12 release.

* Upgrade release to get pyopenssl workaround

15Dkatz/pants,tdyas/pants,tdyas/pants,foursquare/pants,foursquare/pants,15Dkatz/pants,foursquare/pants,twitter/pants,UnrememberMe/pants,tdyas/pants,pantsbuild/pants,pantsbuild/pants,foursquare/pants,15Dkatz/pants,pantsbuild/pants,benjyw/pants,benjyw/pants,baroquebobcat/pants,benjyw/pants,baroquebobcat/pants,foursquare/pants,15Dkatz/pants,wisechengyi/pants,benjyw/pants,15Dkatz/pants,wisechengyi/pants,15Dkatz/pants,pantsbuild/pants,fkorotkov/pants,twitter/pants,benjyw/pants,15Dkatz/pants,foursquare/pants,twitter/pants,tdyas/pants,twitter/pants,baroquebobcat/pants,tdyas/pants,wisechengyi/pants,wisechengyi/pants,foursquare/pants,baroquebobcat/pants,benjyw/pants,foursquare/pants,twitter/pants,baroquebobcat/pants,twitter/pants,fkorotkov/pants,15Dkatz/pants,jsirois/pants,fkorotkov/pants,wisechengyi/pants,fkorotkov/pants,twitter/pants,baroquebobcat/pants,benjyw/pants,pantsbuild/pants,fkorotkov/pants,tdyas/pants,UnrememberMe/pants,wisechengyi/pants,pantsbuild/pants,jsirois/pants,fkorotkov/pants,twitter/pants,UnrememberMe/pants,UnrememberMe/pants,baroquebobcat/pants,baroquebobcat/pants,UnrememberMe/pants,fkorotkov/pants,wisechengyi/pants,pantsbuild/pants,UnrememberMe/pants,baroquebobcat/pants,twitter/pants,wisechengyi/pants,UnrememberMe/pants,jsirois/pants,wisechengyi/pants,UnrememberMe/pants,fkorotkov/pants,UnrememberMe/pants,tdyas/pants,tdyas/pants,tdyas/pants,foursquare/pants