- Use tag, not random sha

- update to 4.19.1:
  * Mark package as compatible with Sphinx 3.1.
  * Refactoring. #528
  * Make debug config variables available in conf.py. #533
  * Fix warning formatting for function lookup. #535
  * Correctly reverse nested namespaces in get_qualification. #540

- Increase required version of Sphinx to the one where module
  cstructobject was introduced. (bsc#1168627)

- version update to 4.18.1
  * 2020-05-10 - Breathe v4.18.1
    - Fix friend class rendering and allow friend struct. #522
    - Add extern examples to doc and remove variable hack. #526
    - Render function candidates without using Sphinx directives. #524
  * 2020-05-02 - Breathe v4.18.0
    - Support tiles in verbatim blocks. #517
  * 2020-05-01 - Breathe v4.17.0
    - Scoped rendering, better integration with Sphinx, misc fixes. #512
  * 2020-04-19 - Breathe v4.16.0
    - Strictly depend on Sphinx's minor version. #498
    - Simplifications and fixes, use more of modern Sphinx natively. #503
    - Add section option to the doxygen(auto)file directive. #501
    - Fix link generation when enum is inside a group (enum FQDN). #508
    - Fix creation of LaTeX math formulas. #506
    - Improve documentation for doxygen(auto)file section option. #509
  * 2020-04-07 - Breathe v4.15.0
    - Add license file to distribution. #492

• Files Changed
• Browse Source