Add links to GitHub Sponsors.

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 To receive my latest updates, you can subscribe to the <a href="rss.xml"><img src="img/rss.png">RSS Feed</a>.
 
+If you'd like, you can [support my open-source work on GitHub Sponsors](https://github.com/sponsors/xythobuz).
+
 ### Recent Posts and Updates
 
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         ·
         <a rel="license" href="http://creativecommons.org/licenses/by/4.0/">CC-BY</a>
         &middot;
+        <a href="https://github.com/sponsors/xythobuz">GitHub Sponsors</a>
+        &middot;
         <a href="http://www.amazon.de/?_encoding=UTF8&amp;camp=1638&amp;creative=19454&amp;linkCode=ur2&amp;site-redirect=de&amp;tag=xythobuzorg-21">Amazon.de Affiliate</a>
         &middot;
         <a href="https://www.paypal.com/us/cgi-bin/webscr?cmd=_send-money&nav=1&email=xythobuz@me.com">PayPal</a>