v0.1.5

What's Changed

• [2048] Add observation by @OkanoShinri in #607
• [Shogi] Fix horse/dragon bug by @sotetsuk in #610
• [2048] Fix test file name by @sotetsuk in #612
• [Shogi] Fix pinned piece bug by @sotetsuk in #613

Full Changelog: v0.1.4...v0.1.5