v2.4.1

What's Changed

• [Visualization] Remove file name assertion by @sotetsuk in #1256
• [Chess] speed up _is_attacked by @sotetsuk in #1257
• [Hex] Modify visualizer.py to handle TypeError when displaying the initial state of hex. by @KazukiOhta in #1261
• [Release] v2.4.1 by @sotetsuk in #1262

Full Changelog: v2.4.0...v2.4.1