Merge pull request XLSForm#566 from yanokwa/v1.6.1

Prepare for v1.7.0

Merge pull request XLSForm#554 from XLSForm/fix-v1.6.0-build

Use Python 3.8 to fix issue with build

Merge pull request XLSForm#537 from lognaturel/v1.5.1

Prepare v1.5.1 release

Merge pull request XLSForm#530 from lognaturel/v1.5.0-release

Prepare for v1.5.0 release

Merge pull request XLSForm#520 from lognaturel/release-v1.4.0

Prepare for v1.4.0 release

Release v1.3.4 (XLSForm#512)

* Release v1.3.4

Merge pull request XLSForm#502 from yanokwa/update

Upgrade to pyxform v1.3.3

Merge pull request XLSForm#497 from yanokwa/release-v1.3.2

Release v1.3.2

Merge pull request XLSForm#494 from lognaturel/prep-v1.3.1

Prepare for release v1.3.1

Merge pull request XLSForm#492 from lognaturel/prep-v1.3.0

Prepare for release v1.3.0