Untagging.
diff --git a/.hgtags b/.hgtags
index c146a24..cb4376c 100644
--- a/.hgtags
+++ b/.hgtags
@@ -67,3 +67,4 @@
 03b6fe57cd6df5bb34ca19f4b760b943186cc806 v2.5b2
 c0abb18299b442e1160d2f958bce18f66850caa9 v2.5b3
 44d10d39092c65ec2febccae726c862ff4b87547 v2.6a1
+0000000000000000000000000000000000000000 v2.6a1