initial plan9 build of tlsdate-helper-plan9.c, doesn't quite build and needs to work around mmap (commented out for now)
diff --git a/CHANGELOG b/CHANGELOG
index 2b3b6b7..c05cd2f 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,4 +1,5 @@
 0.0.7 TBD
+  Add tentative -plan9.[ch] versions of tlsdate-helper.
   Add -x option to tlsdated to override source proxies.
   Correctly check SANs against target host when using proxies.
   Fix a race in tlsdate-dbus-announce that can cause signal drops.