Added donation link to Liberapay.
_OpenTracks_ is a sport tracking application that completely respects your privacy.
+<a href="https://liberapay.com/dennis.guse/donate"><img alt="Donate using Liberapay" src="https://liberapay.com/assets/widgets/donate.svg"></a>
+
## Features:
* __Tracking:__ track your sport and outdoor activities
* __Photos and Markers:__ mark interesting locations while tracking
@@ -17,7 +19,6 @@ _OpenTracks_ is a sport tracking application that completely respects your priva
* _does not Google Play Services_
* _has no cloud integration_
-
__Only required permissions:__
* _ACCESS_FINE_LOCATION_: required to use the GPS.
