Remove tag, to recreate it right away.
diff --git a/.hgtags b/.hgtags
index 74f26b2..dba195e 100644
--- a/.hgtags
+++ b/.hgtags
@@ -59,3 +59,4 @@
 c041b362bb04d8cf1753c47bbb26ade416da8658 v2.5a0
 0000000000000000000000000000000000000000 v2.5a0
 22345d1e6852703d7f45ee825ab99cf8d8c8054b v2.5a0
+0000000000000000000000000000000000000000 v2.5a0