1. Summary
I would like to add a «Donate» Bitcoin button on my README.md file located on my GitHub repository.
2. Not helped
2.1. Manually button
HTML-code using bitcoin protocol:
<a href="bitcoin:1DF9jgzftTFn4ZnDV2YEjUtZ3uHtBywj57?label=In%20the%20treatment%20of%20Sasha's%20teeth&amount=0.0037"><img src="https://www.drupal.org/files/project-images/bitcoindonate.png" alt="Bitcoin Donate Button"></a>
It's work on HTML page of my GitHub Pages site, demonstration.
But in .md GitHub files not one codes of Meta Stack Exchange answer not work for bitcoin protocol, demonstration.
<a href="bitcoin:1DF9jgzftTFn4ZnDV2YEjUtZ3uHtBywj57?label=In%20the%20treatment%20of%20Sasha's%20teeth&amount=0.0037"><img src="https://www.drupal.org/files/project-images/bitcoindonate.png" alt="Bitcoin Donate Button"></a>
[**](bitcoin:1DF9jgzftTFn4ZnDV2YEjUtZ3uHtBywj57?label=In%20the%20treatment%20of%20Sasha's%20teeth&amount=0.0037)
<a href="bitcoin:1DF9jgzftTFn4ZnDV2YEjUtZ3uHtBywj57?label=In%20the%20treatment%20of%20Sasha's%20teeth&amount=0.0037"></a>
2.2. Third-party
JavaScript not supported on GitHub README.md pages. By this reason doesn't help me:

