Update ROM changelog

Author: fidel

contrib/ruby_event_store-rom/CHANGELOG.md

@@ -1,7 +1,11 @@
-### Unreleased
+### 2.2.0
 
 - Change: Minimum required Ruby version is 2.7.0
 
+- Add: Support for bi–temporal queries [#1674]
+
+- Fix: Raise `RubyEventStore::EventNotFound` instead of `ROM::TupleCountMismatchError` if the `event_id` passed to `Specification#from` or `Specification#to` does not exist [#1673]
+
 ### 2.1.0
 
 - Add: Support for Ruby 3.0 [59027ff8ad078e0948bbb190b8a6985c075dcc08]