Pyigtl

Fix inconsistent package version and release tag.

**Full Changelog**: https://github.com/lassoan/pyigtl/compare/v0.3.0...v0.3.1

What's Changed
* Implement POSITION message type by henrykrumb in https://github.com/lassoan/pyigtl/pull/12

New Contributors
* henrykrumb made their first contribution in https://github.com/lassoan/pyigtl/pull/12

**Full Changelog**: https://github.com/lassoan/pyigtl/compare/v0.2.0...v0.3.0

What's Changed
* add missing index_count in metadata header of packed message by vkuhlen in https://github.com/lassoan/pyigtl/pull/7
* Check when server stop requested more often by tao558 in https://github.com/lassoan/pyigtl/pull/4
* Handle non-callable signal handlers by tao558 in https://github.com/lassoan/pyigtl/pull/3

New Contributors
* vkuhlen made their first contribution in https://github.com/lassoan/pyigtl/pull/7
* tao558 made their first contribution in https://github.com/lassoan/pyigtl/pull/4

**Full Changelog**: https://github.com/lassoan/pyigtl/compare/v0.1.0...v0.2.0

First release.