bump documenter version

[codecov[bot]]

Codecov Report

Merging #172 (ff50591) into master (95780ef) will not change coverage. The diff coverage is n/a.

:exclamation: Current head ff50591 differs from pull request most recent head 40cbc3f. Consider uploading reports for the commit 40cbc3f to get more accurate results

@@           Coverage Diff           @@
##           master     #172   +/-   ##
=======================================
  Coverage   91.35%   91.35%           
=======================================
  Files           5        5           
  Lines         613      613           
=======================================
  Hits          560      560           
  Misses         53       53           

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[giordano]

Thanks!