fix EdDSA sign size

[cristaloleg]

No description provided.

[codecov]

Codecov Report

Merging #58 into master will increase coverage by 0.10%.
The diff coverage is 91.30%.

@@            Coverage Diff             @@
##           master      #58      +/-   ##
==========================================
+ Coverage   86.42%   86.53%   +0.10%     
==========================================
  Files          13       13              
  Lines         501      505       +4     
==========================================
+ Hits          433      437       +4     
  Misses         40       40              
  Partials       28       28              

Impacted Files	Coverage Δ
algo_es.go	78.66% <91.30%> (+1.20%)	⬆️

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