0.4.2

What's Changed

• Update images in multi-graph matching examples by @wzever in #82
• Fix gamgm backward testing error by @rogerwwww in #83
• Fix A-star CXX compability error by @rogerwwww in #84
• Fix macos test via adopting a small VOC dataset. by @ziao-guo in #85
• capture ReadError in download by @ziao-guo in #86
• Use importlib to check for installed packages by @bkmgit in #79
• Change the way of setting backends by @rogerwwww in #87
• update examples and docs by @wzever in #88

Full Changelog: 0.4.1...0.4.2