7.0.0

CHANGES:

• BREAKING: dns-client is split into 3 packages: dns-client-lwt,
  dns-client-mirage. If your dune file contains dns-client.lwt, use
  dns-client-lwt now. If your dune file contains dns-client.mirage, use
  dns-client-mirage now (#331 @hannesm)
• update to mirage-crypto 0.11.0 API changes and tls 0.16.0 packaging changes
  (#331 @hannesm)
• dns-client.resolvconf: add line number to parser (#334 @hannesm, inspired by
  #328 @bikallem)
• dns-client.resolvconf: allow zone idx (RFC 4007) for IPv6 entries
  (#334 @hannesm, inspired by #328 @bikallem)
• dns-server.zone: allow zone files without final newline (add a newline to the
  buffer if the last character is not \n) (#333 @hannesm)
• dns-client-{lwt,mirage}: do not log when the resolver closed the connection,
  but there are no pending requests (#332 @reynir)
• dns-certify: in Dns_certify_mirage use X509.Private_key.of_string, the
  behaviour when both key_data and key_seed is provided changed, and leads to
  an exception now (#330 @hannesm)