Fix for CSRF errors on libravatar.org

[fmarier]

See https://bugs.launchpad.net/libravatar/+bug/1706984 for the details.

[codecov-io]

Codecov Report

Merging #214 into develop will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop     #214   +/-   ##
========================================
  Coverage    42.67%   42.67%           
========================================
  Files           69       69           
  Lines         3768     3768           
  Branches       481      481           
========================================
  Hits          1608     1608           
  Misses        2106     2106           
  Partials        54       54

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[jeremycline]

Thanks!