NEWS: describe the RPZ fixes

NEWS

-Knot Resolver 5.x.y (2020-0m-dd)
+Knot Resolver 5.1.2 (2020-07-01)
 ================================
 
 Bugfixes
@@ -9,7 +9,8 @@ Bugfixes
 - cache garbage collector: fix flushing of messages to logs (!1009)
 - cache garbage collector: fix insufficient GC on 32-bit systems (!1009)
 - graphite module: do not block resolver on TCP failures (!1014)
-- policy.rpz: don't warn on NS and SOA records (!1016)
+- policy.rpz various fixes (!1016): $ORIGIN issues,
+  precision of warnings, allow answering with multi-RR sets
 
 
 Knot Resolver 5.1.1 (2020-05-19)