Update README.md

Author: mmcdole

README.md

@@ -27,6 +27,7 @@ It also provides support for parsing several popular predefined extension module
 - [Default Mappings](#default-mappings)
 - [Dependencies](#dependencies)
 - [License](#license)
+- [Donate](#donate)
 - [Credits](#credits)
 
 ## Overview
@@ -239,6 +240,12 @@ Enclosures | /rss/channel/item/enclosure | /feed/entry/link[@rel=”enclosure”
 
 This project is licensed under the [MIT License](https://raw.githubusercontent.com/mmcdole/gofeed/master/LICENSE)
 
+## Donate
+
+I write open source software for fun. However, if you want to buy me a beer because you found something I wrote useful, feel free!
+
+Bitcoin: 1CXrjBBkxgVNgKXRAq5MnsR7zzZbHvUHkJ
+
 ## Credits
 
 * [Mark Pilgrim](https://en.wikipedia.org/wiki/Mark_Pilgrim) and [Kurt McKee](http://kurtmckee.org) for their work on the excellent [Universal Feed Parser](https://github.com/kurtmckee/feedparser) Python library.  This library was the inspiration for the `gofeed` library.