• Replace use of strnlen() due to lack of universal availability. First
  reported by Bill Cole. GitHub issue #71.
• Document the LockFile option in the GeoIP.conf man page. GitHub
  issue #64.
• Remove unused base64 library. PR by Mikhail Teterin. GitHub PR #68.
• Add the new configuration option PreserveFileTimes. If set,
  the downloaded files will get the same modification times as
  their original on the server. Default is 0 (unset).
  PR by Rainer Jung. GitHub PR #63.
• Use the correct types when calling curl_easy_setopt(). This fixes
  warnings generated by libcurl's typecheck-gcc.h. PR by Michael
  Kaufmann. GitHub PR #61.
• In GeoIP.conf, the UserId option was renamed to AccountID and the
  ProductIds option was renamed to EditionIDs. The old options will
  continue to work, but upgrading to the new names is recommended for
  forward compatibility.