Update README.md

Author: shannona

README.md

@@ -162,6 +162,10 @@ v2.1.0 of **Learning Bitcoin from the Command Line** is feature complete and has
 We are also tentatively considering what we could include in a [v3.0](TODO-30.md) of the course. If you'd like to support work of that sort, become a [GitHub Sponsor](https://github.com/sponsors/BlockchainCommons) or support us at our [BTCPay Server](https://btcpay.blockchaincommons.com/), and let us know that **Learning Bitcoin** was the reason why.
 ### Version History
 
+#### 2.2.1 (January 15, 2026)
+
+* Incorporation of PRs and Issues, to close out previous iteration of course, in prep for big 3.0 update.
+
 #### 2.2.0 (November 17, 2021)
 
 * [Portuguese translation](https://github.com/BlockchainCommons/Learning-Bitcoin-from-the-Command-Line/tree/master/pt)