Prep CHANGELOG for 3.0.0 release

Signed-off-by: Jared Ledvina <jared@techsmix.net>

CHANGELOG.md

@@ -6,6 +6,13 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/).
 
 ## [Unreleased]
 
+## [3.0.0] - 2019-02-16
+### Breaking Changes
+- Officially drop support for Ansible 2.3 (@jaredledvina)
+- Switch to `include_tasks` and `import_tasks` (@michaelporter)
+
+### Fixed
+- Update the use of tags to support Ansible 2.5 or higher (@michaelporter)
 
 ## [2.7.0] - 2019-01-31
 ### Fixed
@@ -136,7 +143,8 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/).
 
 First tagged release, starting at 1.0.0 since the project can be considered stable at this point.
 
-[Unreleased]: https://github.com/sensu/sensu-ansible/compare/2.7.0...HEAD
+[Unreleased]: https://github.com/sensu/sensu-ansible/compare/3.0.0...HEAD
+[3.0.0]: https://github.com/sensu/sensu-ansible/compare/2.7.0...3.0.0
 [2.7.0]: https://github.com/sensu/sensu-ansible/compare/2.6.0...2.7.0
 [2.6.0]: https://github.com/sensu/sensu-ansible/compare/2.5.0...2.6.0
 [2.5.0]: https://github.com/sensu/sensu-ansible/compare/2.4.0...2.5.0