Fix #93

[ethe]

No description provided.

[codecov]

Codecov Report

Merging #94 into master will increase coverage by 0.02%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master      #94      +/-   ##
==========================================
+ Coverage   80.84%   80.87%   +0.02%     
==========================================
  Files          35       35              
  Lines        3529     3529              
==========================================
+ Hits         2853     2854       +1     
+ Misses        676      675       -1

Impacted Files	Coverage Δ
thriftpy2/protocol/json.py	83.03% <66.66%> (+0.89%)	⬆️

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