v1.2.0

A lot of version bumps, though mostly actually of GitHub Actions that have nothing to do with the package itself.

Two minor code optimizations:

• code opt: prioritize handling boundary conditions by @hcraM41 in #149
• code opt: replace bytes.Buffer with strings.Builder by @hcraM41 in #151

Full Changelog: v1.1.0...v1.2.0