Release v0.5.0

• Bump version to v0.5.0 (43df466)
• Add hash-based sampling (5983483)

Release v0.4.0

• Bump version to v0.4.0 (a9ccffa)
• Bump version to v0.3.0 (857f3ae)
• Bump version to 0.2.0 (e37e9af)
• Update authors in Cargo.toml (60e9831)
• Improve usability (9a5d7e5)
• Use clap library to handle arg parsing (d203346)
• Use streaming I/O if possible (5d6bf4d)
• Add support for percentage-based sampling (2c7bc8e)
• Add --seed option for deterministic result (bc31ce6)
• Refactor main.rs (c2781cd)
• Add CSV support (8b818f8)
• Add GitHub Actions workflow for Rust CI (79a725b)
• Add VSCode settings and apply cargo fmt (b66849c)
• Add initial implementation of reservoir sampling (9faacd4)