NEWS in rainbows-5.2.0 vs NEWS in rainbows-5.2.1

@@ -1,4 +1,13 @@
+=== Rainbows! 5.2.1 / 2020-01-29 23:34 UTC
+
+  Some documentation updates, mainly to to switch bogomips.org
+  to yhbt.net since the .org TLD won't be affordable in the near
+  future.
+
+  It should also be easier for devs to build gems themselves,
+  since pandoc is no longer a dependency for building manpages.
+
 === Rainbows! 5.2.0 / 2019-01-05 20:38 UTC
 
   Mainly fixes some mismatched indentation warnings with Ruby 2.6+
   Some doc updates, too.