Log Message:
py-authres: updated to 1.0.2

1.0.2:
+ Added DKIM 'a' property so signature algorithm can be reported as proposed
  for inclusion in draft-ietf-dmarc-rfc7601bis (experimental)
+ Added match_signature_algorithm to the DKIMAuthenticationResult class to
  make it easier to find the correct DKIM result based on both domain and
  algorithm
+ Added DKIM 's' property so signature algorithm can be reported as proposed
  for inclusion in draft-ietf-dmarc-rfc7601bis (experimental)