v0.2.0

This is the first release of Spreet that's suitable for use in production.

What's changed

• Resize the target bin as required, instead of hardcoding a square 1.4 times the size of the sprites
• Trim unused transparent pixels from the spritesheet (excluding transparent pixels within sprites)
• Ensure target bin is at least as wide/tall as the widest/tallest sprite
• Pretty-print the JSON in the sprite index file
• Strip symbols from binaries using Cargo
• Add GitHub Actions workflow to draft a new release when a new tag is created
• Use one parallel code generation unit for release
• Bump clap Rust dependency from version 3.1.5 to version 3.1.6
• Bump actions/checkout GitHub Actions dependency from version 2 to version 3

Complete list of commits: v0.1.0...v0.2.0