v0.19.0

What's Changed

• Draft design for extensions (issue #1) by @sdeken in #17
• Docs: sweep for accuracy after 0.18 by @sdeken in #18
• Wiki: user guide, extension developer docs and API reference by @sdeken in #19

New Contributors

• @sdeken made their first contribution in #17

Full Changelog: v0.18.0...v0.19.0