Merge pull request #755 from bashtage/rel-7.2

DOC: Add changes for 7.2 release

Merge pull request #743 from bashtage/updates

MAINT: Update dependencies and add env variable

Merge pull request #722 from bashtage/rls-7

DOC: Update for release 7.0

Merge pull request #707 from bashtage/rls-6.3

RLS: Release 6.3

Merge pull request #681 from bashtage/rls-6.2

RLS: Final changes for release 6.2

Merge pull request #664 from bashtage/fix-632

DOC: Update release note

Merge pull request #663 from bashtage/backport-632

BUG: Fix issue with rescale and AR models

Merge pull request #661 from bashtage/rollback-cython

MAINT: Rollback Cython to 0.29 branch

Merge pull request #660 from bashtage/upgrade-minimums

MAINT: Bump Python to 3.9

Merge pull request #646 from bashtage/rls-5.5

RLS: Rlease note for 5.5