DOC: update ROADMAP file

tcp-request session is OK now.
diff --git a/ROADMAP b/ROADMAP
index 4338b17..dc11b13 100644
--- a/ROADMAP
+++ b/ROADMAP
@@ -27,8 +27,6 @@
   - remove lots of remaining Alert() calls or ensure that they forward to
     send_log() after the fork.
 
-  - tcp-request session
-
   - tcp-request session expect-proxy {L4|L5} if ...
 
   - wait on resource (time, mem, CPU, socket, server's conn, server's rate, ...)