v1.5.2

Full Changelog: v1.3...v1.5.2

On pypi: https://pypi.org/project/holodeck-gw/1.5.2/

Holodeck v1.3

First github "release" of holodeck. Testing pypi automation with github actions.

Updates from v1.2: significant documentation updates, including fixing readthedocs. New 'discrete' submodule for illustris populations. Significant cleanup/streamlining of librarian submodule.

Full Changelog: v1.2...v1.3