Prepare for the new alpha release

Signed-off-by: Marcello Seri <[email protected]>

CHANGES.md

@@ -1,9 +1,11 @@
-## Unreleased
+## v6.0.0~alpha2 (2023-06-20)
 
 - do not omit mandatory null Content-Length headers (mefyl #985)
 - cohttp-async, cohttp-curl-async: compatibility with core/async v0.16.0 (mseri, dkalinichenko-js #976)
 - cohttp-lwt server: call conn_closed before drainig the body of response on error (pirbo #982)
 - cohttp-eio: Relax socket interface requirement on `Server.connection_handler`. (mefyl #983)
+
+## v6.0.0~alpha1 (2023-04-28)
 - cohttp,cohttp-async server: correctly close broken streams (reported by Stéphane Glondu, fix by samhot and anuragsoni)
 - cohttp-eio: remove unused code from tests to work with Eio 0.8 (talex5 #967)
 - Upgrade dune to v3.0 (bikallem #947)