contrib/packaging/Makefile

--- a/contrib/packaging/Makefile	Wed Oct 30 16:39:18 2019 -0400
+++ b/contrib/packaging/Makefile	Thu Oct 31 11:53:11 2019 +0100
@@ -12,9 +12,6 @@
   disco
 
 FEDORA_RELEASES := \
-  20 \
-  21 \
-  28 \
   29
 
 CENTOS_RELEASES := \