Add reviewers for webcodecs

See https://github.com/w3c/webcodecs/issues/692

cc @sandersdan, @Djuffin, @youennf
diff --git a/webcodecs/META.yml b/webcodecs/META.yml
index b5b838a..8570ee0 100644
--- a/webcodecs/META.yml
+++ b/webcodecs/META.yml
@@ -1 +1,5 @@
 spec: https://w3c.github.io/webcodecs/
+suggested_reviewers:
+  - Djuffin
+  - sandersdan
+  - youennf