Add BTC address for donations to readme

README.md

@@ -11,7 +11,7 @@ Mastodon is a federated microblogging engine. An alternative implementation of t
 
 Focus of the project on a clean REST API and a good user interface. Ruby on Rails is used for the back-end, while React.js and Redux are used for the dynamic front-end. A static front-end for public resources (profiles and statuses) is also provided.
 
-If you would like, you can [support the development of this project on Patreon][patreon].
+If you would like, you can [support the development of this project on Patreon][patreon]. Alternatively, you can donate to this BTC address: `17j2g7vpgHhLuXhN4bueZFCvdxxieyRVWd`
 
 [patreon]: https://www.patreon.com/user?u=619786