Fix #77: can not parse IDL from network

[ethe]

No description provided.

[codecov]

Codecov Report

Merging #88 into master will decrease coverage by 0.01%.
The diff coverage is 75%.

@@            Coverage Diff             @@
##           master      #88      +/-   ##
==========================================
- Coverage   80.86%   80.84%   -0.02%     
==========================================
  Files          35       35              
  Lines        3527     3529       +2     
==========================================
+ Hits         2852     2853       +1     
- Misses        675      676       +1

Impacted Files	Coverage Δ
thriftpy2/parser/__init__.py	84.52% <100%> (ø)	⬆️
thriftpy2/parser/parser.py	95.48% <66.66%> (-0.19%)	⬇️

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