Release v6.20.0

[nickdowell]

Enhancements

• Feature flags can now be accessed in the onSend callbacks.
  #1432

• Capture userInfo from all NSExceptions and include the error metadata tab for handled exceptions.
  #1428

• Feature flags are now kept in order of insertion or modification rather than in alphabetical order.
  #1429

• Send usage telemetry to Bugsnag for product improvement purposes. Can be disabled using configuration.telemetry.
  #1422

Bug fixes

• Prevent reporting of OOMs on simulators.
  #1421

• Fix a rare crash in BugsnagBreadcrumbsWriteCrashReport().
  #1430

• Fix intermittent empty thread stacktraces.
  #1425

[github-actions]

	1 Warning
⚠️	This PR modifies BSGRunContext.h but does not change BSGRUNCONTEXT_VERSION

Bugsnag.framework binary size decreased by 936 bytes from 815,472 to 814,536 🎉

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