What's Changed
* Refine documentations and examples. by ziao-guo in https://github.com/Thinklab-SJTU/pygmtools/pull/74
* Add multi-graph examples in documentations by wzever in https://github.com/Thinklab-SJTU/pygmtools/pull/76
* change a_star to astar by heatingma in https://github.com/Thinklab-SJTU/pygmtools/pull/80
**Full Changelog**: https://github.com/Thinklab-SJTU/pygmtools/compare/0.4.0...0.4.1