Merge pull request #1000 from nextstrain/new-augur-clades

Update workflow for new augur clades version

Merge pull request #971: Release v12

Merge pull request #842 from nextstrain/nextclade-align

Nextclade align

Merge pull request #814 from nextstrain/move-filter

Move filter after subsampling

update changelog

Merge pull request #703 from nextstrain/epiweeks

Annotate epiweek as color and filter option

Merge pull request #640 from nextstrain/support-default-gisaid-metadata

Support default GISAID metadata and sequences

Update change log for v6 release

Merge pull request #615 from nextstrain/drop-backward-compatibility

Drop backward compatibility

Merge pull request #605 from nextstrain/support-gisaid-downloads

Support GISAID downloads