Major Changes
* export: Move extensions block to meta [888][] (corneliusroemer)
Note: this is technically a breaking change, but the misplaced extensions block was added in version 14.1.0 and intended for internal use by Nextclade. We don't expect any users to be impacted by this.
Features
* filter: Support relative dates for `--min-date` and `--max-date` [740][] (benjaminotter, victorlin)
* frequencies: Support relative dates for `--min-date` and `--max-date` [890][] (victorlin, huddlej)
* docs: Add page describing how to use your own tree builder [884][] (jameshadfield, joverlee521)
Bug Fixes
* parse: Fix `--fix-dates` [878][] (huddlej)
* tree: Fix internal comment on excluded sites [880][] (jameshadfield)
[888]: https://github.com/nextstrain/augur/pull/888
[740]: https://github.com/nextstrain/augur/pull/740
[890]: https://github.com/nextstrain/augur/pull/890
[884]: https://github.com/nextstrain/augur/pull/884
[878]: https://github.com/nextstrain/augur/pull/878
[880]: https://github.com/nextstrain/augur/pull/880