Set release date for 2.12.4

README.md

@@ -58,7 +58,7 @@ For instructions on installing the root server, see [the page on installing a ne
 CHANGELIST
 ----------
 
-***Version 2.12.4* ** *- UNRELEASED*
+***Version 2.12.4* ** *- December 15, 2018*
 - Made sorting case-insensitive, for users and service bodies.
 - When creating URLs for static content, the HTTP_X_FORWARDED_PORT and HTTP_X_FORWARDED_PROTO headers are now inspected for determining the port and protocol. 
 - Added sorting to semantic workshop for service bodies and formats.