Add rmr_get_xact function

The rmr_get_xact function can be used to extract the transaction
information from a message. This is a convenience function.

Signed-off-by: E. Scott Daniels <daniels@research.att.com>
Change-Id: I303478df3e9558740b2c193c99416c2dfa9b9475
diff --git a/CHANGES b/CHANGES
index 3e1ae6d..8c54566 100644
--- a/CHANGES
+++ b/CHANGES
@@ -2,6 +2,10 @@
 API and build change  and fixe summaries. Doc correctsions
 and/or changes are not mentioned here; see the commit messages.
 
+2019 August 13; version 1.2.0 (API change, non-breaking)
+	The function rmr_get_xact() was added to proide a convenient
+	way to extract the transaction field from a message.
+
 2019 August 8; version 1.1.0 (API change)
 	This change should be backward compatable/non-breaking
 	A new field has been added to the message buffer (rmr_mbuf_t).