Log Message:
Update p5-Tree-DAG_Node to 1.11.

Changes from previous:
----------------------
[V 1.11]
2013-02-04T09:50:00

- Correct the date (2012 -> 2013) in this file used for V 1.10.
- Correct the text at L<Tree::DAG_Node/AUTHOR> so it refers to
Artistic License 2.0, which now matches what it says in Build.PL and
Makefile.PL. Resolves RT#83088.