Release v2.3.2

v2.3.2 includes the following improvements:

• Significant performance gains when generating the MaxMind datasets. See issue #16 and PR #24 .
• The dbip download checksum is now validated. This includes the addtition of --checksum/--no-checksum flags. See issue #12 and PR #22 .
• Automatic calculation of ipset maxelem to avoid issues when a set contains more elements than the ipset default. See PR #20. Thanks to @johnmave126 .
• Improved security for the example systemd unit file. See issue #18 and PR #21 .