Update CHANGELOG.md

Co-authored-by: William Woodruff <william@yossarian.net>
Signed-off-by: Aleks <121458075+SequeI@users.noreply.github.com>

Author: SequeI

CHANGELOG.md

@@ -16,7 +16,7 @@ All versions prior to 0.9.0 are untracked.
 
 * Added support for ed25519 keys.
   [#1377](https://github.com/sigstore/sigstore-python/pull/1377)
-* api: `IdentityToken` now supports `client_id` for audience claim validation.
+* API: `IdentityToken` now supports `client_id` for audience claim validation.
   [#1402](https://github.com/sigstore/sigstore-python/pull/1402)