Omnibear version 2.1.0

This release improves indieauth support, adding PKCE verification

• Bump qs from 6.14.0 to 6.14.1 by @dependabot[bot] in #128
• catch errors fetching syndication targets by @aciccarello in #136
• Bump preact from 10.28.1 to 10.28.2 by @dependabot[bot] in #141
• add pkce auth support by @aciccarello in #142

Files available for manual install on the GitHub releases page.

• omnibear-2.1.0-chrome.zip
• omnibear-2.1.0-firefox.zip
• omnibear-2.1.0-sources.zip

Full Changelog: https://github.com/omnibear/omnibear/compare/v2.0.2...v2.1.0