Missing copyright notice, list of conditions, and disclaimer

[NathanSweet]

Hi, it is great to see support for Spine animations! :) I don't mean to be annoying, but can you please include the BSD license header for any Spine source code that was used? Here is the license:

https://github.com/EsotericSoftware/spine-runtimes/blob/master/LICENSE

For example, this code:

https://github.com/gamebuilderstudio/spineruntimeas3lib/blob/master/src/spine/RotateTimeline.as#L46

Seems to be based on this code:

https://github.com/EsotericSoftware/spine-runtimes/blob/master/spine-libgdx/src/com/esotericsoftware/spine/Animation.java#L228

But is missing the copyright notice, list of conditions, and disclaimer from the BSD license. You can still add your own copyright notice and MIT license of course.

Thanks!
-Nate