2.13.0

• IMPORTANT: Java 8 is now required. If you need Java 7 support, please
  continue using 2.12.0.
• DatabaseReader now provides the methods that return an Optional rather
  than throwing an exception when the record is not found in the database. These
  methods are prefixed with "try". Closes #28. Pull request by Luke Butters.
  GitHub #147.
• getNetwork() methods have been added to the various response models. These
  return a com.maxmind.db.Network object representing the largest network
  where all the fields besides the IP address are the same.
• Updated documentation of anonymizer methods isAnonymousVpn() and
  isHostingProvider() to be more descriptive.
• The DatabaseReader methods city() and country() can now be called on
  the Enterprise database and the country() method can be called on City
  databases. Request by Gergely Boromissza. GitHub #132.
• New getStaticIpScore() and getUserCount() methods were added to
  com.maxmind.geoip2.record.Traits for use with GeoIP2 Precision Insights.
  They represent a measure of how static or dynamic an IP address is, and an
  estimate of the number of users sharing a given address or network,
  respectively.