Irrd

**This rc1 release has a new database migration, so you have to run irrd_database_upgrade even if you were running beta 4 already.**
Unless any issues are found, this is planned to be the 4.1 release.

Changes:
* Convert whois handling to use long-running workers (and reduced max_connections default to 10 to reduce default memory use)
* Add scope filter (4)
* Add better handling of exports when serials are unknown (356)
* Add !J command and modified !j command (339, 322)
* Add last-modified attribute to authoritative objects (290)
* Add support for custom logging configs (299)
* Only log NRTM RPKI status for relevant objects when RPKI is enabled
* Add support for database downgrades and docs in 4.1 release notes (333)
* Consistently log query time in same number of decimals.
* Read RPSL files iteratively, reducing IRRd memory usage. (342)
* End RIPE-style whois responses with two empty lines. (335)
* Ignore trailing slash in status page URL (336)
* Add note about maxmemory Redis setting to docs. (323)

https://irrd.readthedocs.io/en/v4.1.0b4/releases/4.1.0.html

- Fix 271 - Add synthethic NRTM. (325)
- Ref 323 - Ensure correct error logging in preload updates
- Enable SO_REUSEADDR on TCP sockets.
- Fix 320 - Fix Python 2.6 compatibility (327)

https://irrd.readthedocs.io/en/v4.1.0b3/releases/4.1.0.html

Ref 302 - Fix issue where SLURM prefixFilters could apply to prefixAssertions
Ref 306 - Fix issue with binding to IPv6 addresses.
Add note about roa_import timer being in seconds
Fix 311 - Fix issue with multiline primary keys
Fix 312 - Add support for NRTM over IPv6

Dependency updates (313)
* Update ordered-set from 3.1.1 to 4.0.1
* Update redis from 3.4.1 to 3.5.0

https://irrd.readthedocs.io/en/v4.1.0b2/releases/4.1.0.html

https://irrd.readthedocs.io/en/v4.1.0b1/releases/4.1.0.html

IRRd 4.0.8 was released on November 12th, 2019.
It adds two minor features[1]:

* An `` EOF`` marker is added to the end of all exports.
* Ordering in exports is now consistent between exports.

[1] https://github.com/irrdnet/irrd4/issues/268