[musicians-guide] Update revision history to build documents properly with Publican 4

[Jared Smith]

commit f52bd8bddd896656959ca4b216c22c9b92082d4f
Author: Jared K. Smith <jaredsmith at jaredsmith.net>
Date:   Fri Mar 21 15:20:46 2014 -0400

    Update revision history to build documents properly with Publican 4

 en-US/Revision_History.xml |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/en-US/Revision_History.xml b/en-US/Revision_History.xml
index 197e383..0505d88 100644
--- a/en-US/Revision_History.xml
+++ b/en-US/Revision_History.xml
@@ -440,7 +440,7 @@
 			</revision>
 
 			<revision>
-				<revnumber>18.9</revnumber>
+				<revnumber>18.9-1</revnumber>
 				<date>?? June 2012</date>
 				<author>
 					<firstname>Christopher</firstname>