Add index for updated_at field
Add uniqueness constraint on uid
Merge pull request #265 from alphagov/add_uniqueness_constraint_to_uid

Add uniqueness constraint on uid
Merge pull request #263 from alphagov/add_updated_at_index_to_edition

Add index for updated_at field
Public timestamp is first ed. when no major change

When no major changes have been made to an edition public_updated_at
should return the public timestamp of the first edition not the latest
edition.
Merge pull request #266 from alphagov/public_timestamp_with_no_major_changes

Public timestamp is first ed. when no major change
Validate smart quotes as normal quotes in links

www.agileplannerapp.com/boards/173808/cards/8852

the `LinkValidator` regex doesn't validate correctly
when the link contains smart quotes. corrected that
so that we can update travel advice publisher to use
the latest version of govuk_content_models.
Version to 26.3.0
Merge pull request #268 from alphagov/version_bump

Version to 26.3.0
Release 27.0.0

This releases gem version 27.0.0, which includes a breaking change to 
the `User` model.

As the breaking change was inadvertently included in the previous minor
update, we yanked the release and are re-issuing it as a major version
bump.
Merge pull request #269 from alphagov/release-27-0-0

Release 27.0.0
Merge pull request #267 from alphagov/validate-smart-quotes-in-links-as-normal-quotes

Validate smart quotes as normal quotes in links
Release 27.1.0

www.agileplannerapp.com/boards/173808/cards/8852

Updates the LinkValidator to validate smart quotes
in the same way as normal quotes.

Releases: alphagov/govuk_content_models#267
Merge pull request #270 from alphagov/version-bump

Release 27.1.0
Add unassign action