- update to version 2.1.0:
 * End-of-line comments are now associated with rdata when read from text.
   For backwards compatibility with prior versions of dnspython, they are
   only emitted in to_text() when requested.
 * Synchronous I/O is a bit more efficient, as we now try the I/O and only
   use poll() or select() if the I/O would block.
 * The resolver cache classes now offer basic hit and miss statistics, and
   the LRUCache can also provide hits for every cache key.
 * The resolver has a canonical_name() method.
 * There is now a registration mechanism for EDNS option types.
 * The default EDNS payload size has changed from 1280 to 1232.
 * The SVCB, HTTPS, and SMIMEA RR types are now supported.
 * TSIG has been enhanced with TKEY and GSS-TSIG support.  Thanks to
   Nick Hall for writing this.
 * Zones now can be updated via transactions.
 * A new zone subclass, dns.versioned.Zone is available which has a
   thread-safe transaction implementation and support for keeping many
   versions of a zone.
 * The zone file reading code has been adapted to use transactions, and
   is now a public API.
 * Inbound zone transfer support has been rewritten and is available as
   dns.query.inbound_xfr() and dns.asyncquery.inbound_xfr().  It uses
   the transaction mechanism, and fully supports IXFR and AXFR.

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