This release merges generate-github-markdown-css 5.1.0 which provides [data-theme] selectors and GitHub also made some visible changes, for example, the Dark theme is darker -- links are in dark blue. So I decided to release it as a minor version update. It will be aligned with GitHub but someone may not like it.

The official one comes to 5.0.0, I'll update this script and backup current one here.