First step in the Vim 7.3 branch.  Changed version numbers.
diff --git a/README.txt b/README.txt
index 19e59c6..998a7ff 100644
--- a/README.txt
+++ b/README.txt
@@ -1,4 +1,4 @@
-README.txt for version 7.2 of Vim: Vi IMproved.
+README.txt for version 7.3a of Vim: Vi IMproved.
 
 
 WHAT IS VIM