README: add human tech badge :)
Fixes
_OpenTracks_ is a sport tracking application that completely respects your privacy.
+[![Awesome Humane Tech](https://raw.githubusercontent.com/humanetech-community/awesome-humane-tech/main/humane-tech-badge.svg?sanitize=true)](https://github.com/humanetech-community/awesome-humane-tech)
+
<table>
<tr>
<th>Free</th>
