v0.19.0

What's Changed

• Modernize gem and move tests to sus. by @ioquatix in #14
• CI: use newer versions of GH Actions by @olleolleolle in #16
• Add dependency bigdecimal by @olleolleolle in #15
• Modernize gem. by @ioquatix in #17

Full Changelog: v0.18.2...v0.19.0