0.9.0

What's Changed

• Improve Git install by @ken-matsui in #828
• Bump up toml11 to 01a0e93e5f9bef09a76d22f3d51a5257e3d923fe by @ken-matsui in #831
• Support LTO by @ken-matsui in #832
• Support CXXFLAGS in poac.toml by @ken-matsui in #833
• Enable clang-tidy by @ken-matsui in #834
• Reduce heap allocations by @ken-matsui in #835
• More constness by @ken-matsui in #836
• Implement tidy command by @ken-matsui in #837
• Enable more clang-tidy checks by @ken-matsui in #838
• Simplify Makefile by @ken-matsui in #839
• Bump up toml11 to v3.8.0 by @ken-matsui in #840
• Minimize memory consumption by @ken-matsui in #841
• Implement search command by @ken-matsui in #842

Full Changelog: 0.8.0...0.9.0