Changed the patch level to 1.5a3, to avoid confusion with a2 (I'm not
ready for a release yet).
diff --git a/Include/patchlevel.h b/Include/patchlevel.h
index 460a27f..311fd88 100644
--- a/Include/patchlevel.h
+++ b/Include/patchlevel.h
@@ -1 +1 @@
-#define PATCHLEVEL "1.5a2"
+#define PATCHLEVEL "1.5a3"