0.1.0-beta4 'Irish Goodbye'

Breaking changes

• Remove systemd socket binding to port 53 in supplied packages (#847 by
  @ximon18).

Bug fixes

• If the input zone contains DNSSEC records, they are removed during signing,
  but (changes to them) were still showing up in IXFR output from the signed
  zone; remove them from IXFRs (#835 by @bal-e, reported in #798 by
  @gryphius).

• Overhaul how signing operations are enqueued for concurrency control,
  preventing aborted signing operations from accumulating memory (#789 by
  @bal-e, reported in #675 by @Philip-NLnetLabs)

Other changes

• Extend cascade tsig remove error to report the users of the key. (#719 by
  @ximon18)
• Reduce the memory use of RRSIGs during incremental signing. (#824 by
  @Philip-NLnetLabs)

Documentation improvements

• Update note about compatibility with NetHSM. (#621 by @jans23)
• Document the cascade info command (#838 by @ximon18)
• Add a CONTRIBUTING.md (#850 by @tertsdiepraam)

Known issues

• Cascade can crash due to a race condition when removing a zone. (#730,
  reported by @jpmens)

Acknowledgements

Thanks to @jpmens, @gryphius, and @jans23 for testing Cascade and providing
valuable feedback and contributions!