- Update to 1.19.0:
  * Features:
    - Fix #850: [FR] Ability to use specific database in Redis, with
      new redis-logical-db configuration option.
    - Merge #944: Disable EDNS DO. Disable the EDNS DO flag in upstream
      requests. This can be helpful for devices that cannot handle
      DNSSEC information. But it should not be enabled otherwise, because
      that would stop DNSSEC validation. The DNSSEC validation would not
      work for Unbound itself, and also not for downstream users. Default
      is no. The option is disable-edns-do: no
    - Expose the script filename in the Python module environment 'mod_env'
      instead of the config_file structure which includes the linked list
      of scripts in a multi Python module setup; fixes #79.
    - Expose the configured listening and outgoing interfaces, if any, as
      a list of strings in the Python 'config_file' class instead of the
      current Swig object proxy; fixes #79.
    - Mailing list patches from Daniel Gröber for DNS64 fallback to plain
      AAAA when no A record exists for synthesis, and minor DNS64 code
      refactoring for better readability.
    - Merge #951: Cachedb no store. The cachedb-no-store: yes option is
      used to stop cachedb from writing messages to the backend storage.
      It reads messages when data is available from the backend.
      The default is no.
  * Bug Fixes:
    - Fix for version generation race condition that ignored changes.
    - Fix #942: 1.18.0 libunbound DNS regression when built without OpenSSL.
    - Fix for WKS call to getservbyname that creates allocation on exit in
      unit test by testing numbers first and testing from the services list later.
    - Fix autoconf 2.69 warnings in configure.
    - Fix #927: unbound 1.18.0 make test error. Fix make test without SHA1.

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