README.md in aixm-1.4.3 vs README.md in aixm-1.5.0

@@ -1,18 +1,20 @@
 [![Version](https://img.shields.io/gem/v/aixm.svg?style=flat)](https://rubygems.org/gems/aixm)
 [![Tests](https://img.shields.io/github/actions/workflow/status/svoop/aixm/test.yml?style=flat&label=tests)](https://github.com/svoop/aixm/actions?workflow=Test)
 [![Code Climate](https://img.shields.io/codeclimate/maintainability/svoop/aixm.svg?style=flat)](https://codeclimate.com/github/svoop/aixm/)
-[![Donorbox](https://img.shields.io/badge/donate-on_donorbox-yellow.svg)](https://donorbox.org/bitcetera)
+[![GitHub Sponsors](https://img.shields.io/github/sponsors/svoop.svg)](https://github.com/sponsors/svoop)
 
 # AIXM
 
 Partial implementation of the [Aeronautical Information Exchange Model (AIXM 4.5)](http://aixm.aero) and it's dialect [Open FlightMaps eXchange format (OFMX 0)](https://gitlab.com/openflightmaps/ofmx/wikis) for Ruby.
 
 For now, only the parts needed to automize the AIP import of [open flightmaps](https://openflightmaps.org) are part of this gem. Most notably, the gem is only a builder for snapshot files and does not parse them.
 
 * [Homepage](https://github.com/svoop/aixm)
 * [API](https://www.rubydoc.info/gems/aixm)
 * Author: [Sven Schwyn - Bitcetera](https://bitcetera.com)
+
+Thank you for supporting free and open-source software by sponsoring on [GitHub](https://github.com/sponsors/svoop) or on [Donorbox](https://donorbox.com/bitcetera). Any gesture is appreciated, from a single Euro for a ☕️ cup of coffee to 🍹 early retirement.
 
 ## Install
 
 ### Security