Set the patch level to 1.5.1.  (I'm not going to release this as a
beta -- if there are bugs, I'll post a patch page and release 1.5.2
sooner.)
diff --git a/Include/patchlevel.h b/Include/patchlevel.h
index ce4ea1b..d6054c4 100644
--- a/Include/patchlevel.h
+++ b/Include/patchlevel.h
@@ -1 +1 @@
-#define PATCHLEVEL "1.5"
+#define PATCHLEVEL "1.5.1"