Gff3tool

This release includes:

- fixing bugs with the phase calculation for CDS features on the negative strand and multi-isoform models
- updating the error level of the error messages (INFO, WARNING, ERROR) according to issue 114, providing the error level in output files, and updating corresponding documentation
- migrating from Travis to Github Actions and adding tests on Windows

This release includes several minor bug fixes.

This release includes:

- several minor bug fixes;
- gzip support (thanks ctcncgr!)
- documentation fixes (thanks for the pointer adf-ncgr!)

This release includes bug fixes to gff3_fix.

This is the initial python3 release for the GFF3toolkit. It is compatible with python3, but not python2.7. Please use release v1.4.5 if you prefer to use python2.7.

This is the final python2.7 release for the GFF3toolkit.
This update includes:
- Fixes issue 85
- minor bug fixes