v0.22.0

What's Changed

• Limit number of rings in polygons to 500 by @bcamper in #810 (fixes #773)
• Fix source with transform reloads by @wangxingkai in #789
• Fix external fonts by @bcamper in 6743110 (fixes #771)
• Fix scene.setDataSource() with data property in Firefox by @bcamper in #772 (fixes #772)
• Update npm / build dependencies by @bcamper in #811

Full Changelog: v0.21.1...v0.22.0