Version 0.5.2

• Add IPCC2006_PRIMAP categorization.
• Add refrigerant sub-classes and additional codes to CRFDI_class.

Version 0.5.1

• Add BURDI, CRFDI, BURDI_class, and CRFDI_class categorizations and scripts to generate
  them from the UNFCCC DI flexible query API.

Version 0.5.0

• Switch to_yaml() output to ruamel.yaml so that valid, correctly typed YAML 1.2
  is written. This should enable easier re-use of the data in other contexts.
• Consistently use title case for titles in IPCC categorizations.

Version 0.4.0

• Add more unit tests.
• Add consistency tests for IPCC categorizations.
• Update documentation.
• Add data format documentation.

Version 0.3.2

• Use tbump for simpler versioning.

Version 0.3.1

• Properly include data files in binary releases.

Version 0.3.0

• Add IPCC1996 categorization and scripts to generate it from the source pdf.
• Change packaging to declarative style.
• Automate generation of pickled files via Makefile.
• Automate loading of included categorizations.

Version 0.2.2

• Introduce API for multiple codes and multiple children.
• Implement classes and functions.
• Add IPCC2006 categorization and scripts to generate it from the source pdf.

Version 0.2.1

• Introduce API for multiple codes and multiple children.
• Implement classes and functions.
• Add IPCC2006 categorization and scripts to generate it from the source pdf.