Announce Hydrogen support

Related to https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/1055

CHANGELOG.md

@@ -1,3 +1,14 @@
+# 2021-05-21
+
+## Hydrogen support
+
+Thanks to [Aaron Raimist](https://github.com/aaronraimist), the playbook now supports [Hydrogen](https://github.com/vector-im/hydrogen-web) - a new lightweight matrix client with legacy and mobile browser support.
+
+By default, we still install Element, as Hydrogen is still not fully-featured. Still, people who'd like to try Hydrogen out can now install it via the plabook.
+
+Additional details are available in [Setting up Heisenbridge bouncer-style IRC bridging](docs/configuring-playbook-client-hydrogen.md).
+
+
 # 2021-05-19
 
 ## Heisenbridge support

docs/configuring-playbook.md

@@ -68,6 +68,8 @@ When you're done with all the configuration you'd like to do, continue with [Ins
 
 - [Adjusting email-sending settings](configuring-playbook-email.md) (optional)
 
+- [Setting up Hydrogen](configuring-playbook-client-hydrogen.md) - a new lightweight matrix client with legacy and mobile browser support (optional)
+
 
 ### Authentication and user-related