Bump version number to 2.3
diff --git a/configure.in b/configure.in
index b0d5b1f..f416dc3 100644
--- a/configure.in
+++ b/configure.in
@@ -6,7 +6,7 @@
 
 # Set VERSION so we only need to edit in one place (i.e., here)
 AC_SUBST(VERSION)
-VERSION=2.2
+VERSION=2.3
 
 # Arguments passed to configure.
 AC_SUBST(CONFIG_ARGS)