Prevent unneeded usleep after send retries

If retries were enabled, an extra usleep for 1mu-sec was being
unnecessarily executed after the last retry attempt.

Doc related to retries modifided in main rmr_nng module.

Signed-off-by: E. Scott Daniels <daniels@research.att.com>
Change-Id: If8032a86bba5df63231c6dd5e50f262c64875c13
diff --git a/CHANGES b/CHANGES
index e39544c..dc94525 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,6 +1,9 @@
 
 Change Summaries
 
+2019 July 15; Version 1.0.39
+	Prevent unnecessary usleep in retry loop.
+
 2019 July 12; Version 1.0.38
 	Added new message types to RIC_message_types.h.