First step in the Vim 7.3 branch.  Changed version numbers.
diff --git a/README_os390.txt b/README_os390.txt
index 0deff25..b03eb14 100644
--- a/README_os390.txt
+++ b/README_os390.txt
@@ -1,4 +1,4 @@
-README_os_390.txt for version 7.2 of Vim: Vi IMproved.
+README_os_390.txt for version 7.3a of Vim: Vi IMproved.
 
 Welcome to the OS/390 Unix port of VIM.