Fix a typo in a comment

[bgrant]

No description provided.

[codecov]

Codecov Report

Merging #143 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master     #143   +/-   ##
=======================================
  Coverage   96.55%   96.55%           
=======================================
  Files          14       14           
  Lines        1075     1075           
=======================================
  Hits         1038     1038           
  Misses         37       37

Impacted Files	Coverage Δ
jose/jwt.py	100% <100%> (ø)	⬆️

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[zejn]

Thanks.