Fix changelog for subscriptions (#348)

Failed to fix this up after merging main.

I have:
- [x Written a clear PR title and description (above)
- [x] Signed the [Khan Academy CLA](https://www.khanacademy.org/r/cla)
- [x] Added tests covering my changes, if applicable
- [x] Included a link to the issue fixed, if applicable
- [x] Included documentation, for new features
- [x] Added an entry to the changelog

docs/CHANGELOG.md

@@ -27,6 +27,8 @@ When releasing a new version:
 
 ### New features:
 
+- genqlient now supports subscriptions; the websocket protocol is by default `graphql-transport-ws` but can be set to another value.  
+  See the [documentation](FAQ.md) for how to `subscribe to an API 'subscription' endpoint`.
 - genqlient now supports double-star globs for schema and query files; see [`genqlient.yaml` docs](genqlient.yaml) for more.
 
 ### Bug fixes:
@@ -42,8 +44,6 @@ In addition to several new features and bugfixes, along with this release comes
 
 ### New features:
 
-- genqlient now supports subscriptions; the websocket protocol is by default `graphql-transport-ws` but can be set to another value.  
-  See the [documentation](FAQ.md) for how to `subscribe to an API 'subscription' endpoint`.
 - The new `optional: generic` allows using a generic type to represent optionality. See the [documentation](genqlient.yaml) for details.
 - For schemas with enum values that differ only in casing, it's now possible to disable smart-casing in genqlient.yaml; see the [documentation](genqlient.yaml) for `casing` for details.
 - genqlient now supports .graphqls and .gql file extensions for schemas and queries.