Update README.md

Include license information in README.

Author: sammycage

README.md

@@ -209,3 +209,7 @@ $ svg2png input.svg 512x512 0xff00ffff
 - [CARLA Simulator](https://carla.org/)
 - [AUI Framework](https://github.com/aui-framework/aui)
 - [Software Companions](http://www.softwarecompanions.com)
+
+## License
+
+LunaSVG is licensed under the MIT License, see [LICENSE](https://github.com/sammycage/lunasvg/blob/master/LICENSE) for more information.