0.006   2023-11-11  Released-By: PERLANCAR; Urgency: medium
        - Add function: get_feature_defhash.
0.005   2021-07-31  Released-By: PERLANCAR; Urgency: low
        - No functional changes.
        - [doc] Tweak Abstract and Description.
0.004   2021-02-26  Released-By: PERLANCAR; Urgency: medium
        - Add argument fatal_on_load_failure in get_feature_set_spec(),
          get_features_decl() (currently undocumented).
0.003   2021-02-25  Released-By: PERLANCAR; Urgency: medium
        - get_features_decl(): Add x.source attribute in result.
        - Add routine: get_feature_set_spec.
0.002   2021-02-24  Released-By: PERLANCAR; Urgency: medium
        - Add option to load modules in get_features_decl() (currently
          undocumented).
0.001   2021-02-24  Released-By: PERLANCAR
        - First release.