If you made any significant change to the code that you consider worth being
reminded on the Release Notes, also include a correspondent entry here. If you
are not sure in which release your code will be released, include it on the
latest release and leave it to the commiter or RM responsible for it.

v 1.5.0 (unreleased)
  - Allow groups to disable admin email notificationo
  - Add option to HighlightsBlock to open link in a new tab
  - Move blocks html generation from models to helpers

v 1.4.0
  - Migration from Rails 3 to Rails 4!