changelog: Note the removal of requester-api meson option

This should be noted for anyone who might be using it, though it appears
no-one was (hence its removal).

Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
Change-Id: Iadd30e6f0471c8d7991aac24761413c01020c39a
diff --git a/CHANGELOG.md b/CHANGELOG.md
index fccb5bd..f008bb9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -30,3 +30,7 @@
 1. requester: Make pldm_open() return existing fd
 2. transport: Prevent sticking in waiting for response
 3. transport: Match on response in pldm_transport_send_recv_msg()
+
+### Removed
+
+1. libpldm: Remove the requester-api option