Prepare v0.22.0 release (#210)

Author: arminru

semantic-conventions/CHANGELOG.md

@@ -4,11 +4,15 @@ Please update the changelog as part of any significant pull request.
 
 ## Unreleased
 
+## v0.22.0
+
 - When an attribute is referenced using `ref:` from a group that already inherits the attribute with `extends:`, resolve the reference to the closest inherited attribute instead of the primary definition. This makes a difference in case the inherited reference overwrites any properties.
   ([#204](https://github.com/open-telemetry/build-tools/pull/204))
 - Sort attributes by name
   ([#205](https://github.com/open-telemetry/build-tools/pull/205))
-
+- Fix referencing template attributes
+  ([#206](https://github.com/open-telemetry/build-tools/pull/206))
+  
 ## v0.21.0
 
 - Render template-type attributes from yaml files