Alpha Release v0.2.0

[jngls]

What's Changed

• Add license to source files by @alexmadeathing in Add license to source files #14
• u128 now fully supported by @alexmadeathing in u128 now fully supported #18
• Update README.md by @alexmadeathing in Update README.md #19
• Bump version number in Cargo.toml to v0.2.0 by @alexmadeathing in Bump version number in Cargo.toml to v0.2.0 #20

Full Changelog: v0.1.0...v0.2.0

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This discussion was created from the release Support for u128.

[jngls]

I was curious to suss out github's release notes auto-generation. Seems nice.