Release v0.8.0 (#370)

Subscriptions, which are the main new addition, now seem stable enough.
As usual I cleaned up the changelog a bit, and will then tag this commit
as the new version.

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

Author: benjaminjkraft

docs/CHANGELOG.md

@@ -20,18 +20,27 @@ When releasing a new version:
 
 <!-- Add new changes in this section! -->
 
+### Breaking changes:
+
+### New features:
+
+### Bug fixes:
+
+## v0.8.0
+
+This release adds support for genqlient subscriptions; see the [documentation](subscriptions.md) for more, and thanks to @matthieu4294967296moineau for the original implementation and @HaraldNordgren for additional testing and improvements.
+
 Note that genqlient now requires Go 1.22.5 or higher, and is tested through Go 1.23.3.
 
 ### Breaking changes:
 
-- omitempty validation:
-  - forbid `omitempty: false` (including implicit behaviour) when using pointer on non-null input field
-- The error text for HTTP errors has changed slightly. If you were parsing it, switch to [`As`-ing to `graphql.HTTPError`](client_config.md#handling-errors)_.
+- genqlient now forbids `omitempty: false` (including implicit behaviour) when using pointer on non-null input field.
+- The error text for HTTP errors has changed slightly. If you were parsing it, switch to [`As`-ing to `graphql.HTTPError`](client_config.md#handling-errors).
 
 ### 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`.
+  See the [documentation](subscriptions.md) for more details on how to use subscriptions.
 - genqlient now supports double-star globs for schema and query files; see [`genqlient.yaml` docs](genqlient.yaml) for more.
 - genqlient now generates slices containing all enum values for each enum type.
 - genqlient now returns `Is`/`As`-able errors when the HTTP request returns a non-200 status.