What's Changed
- fix data race in index cache by @imjasonh in #1369
- fix concurrent annotation map update by @imjasonh in #1370
- set downloadLocation to NOASSERTION when apk.URL is unset by @imjasonh in #1372
- Make MergeInto threadsafe by @jonjohnsonjr in #1374
Full Changelog: v0.19.3...v0.19.4