- Update to 5.3.1:
  * Ignore UnicodeDecodeError exceptions when querying for TXT records
  * Check DNSSEC on MX hostnames
  * USE DNSSEC when requesting DNSKEY records
  * Do not require an RRSIG answer when querying for DNSKEY records
  * Pass in nameservers and timeout when running get_dnskey recursively
  * Properly cache DNSKEY answers
  * Fix exception handling for query_mta_sts_record
  * Check for TLSA records
  * Add support for parsing SMTP TLS Reporting (RFC8460) DNS records
  * Add missing import dns.dnssec
  * Always use the actual subdomain or domain provided
  * Include MTA-STS and BIMI results in CSV output
  * Added the include_tag_descriptions parameter to
    checkdmarc.bimi.check_bimi()
  * Added the exception class MTASTSPolicyDownloadError
  * Major refactoring: Change from a single module to a package of modules,
    with each checked standard as its own package
  * Add support for MTA-STS RFC 8461
  * Add support for BIMI
  * Specify a BIMI selector using the --bimi-selector/-b option
  * Fix SPF query error and warning messages
  * Add support for null MX records - RFC 7505
  * Make DMARC retorting URI error messages more clear
  * Fix compatibility with Python 3.8
  * SPFRecordNotFound exception now includes a domain argument
  * The DMARC missing authorization error message now includes the full
    expected DNS record
  * Properly parse DMARC and BIMI records for domains that do not have an
    identified base domain

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Seems like a good idea, not much obnoxious dependencies.

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