TST: test 3.4 on windows

[jreback]

BLD: bug in building json compiled code

[codecov]

Codecov Report

Merging #15857 into master will increase coverage by 0.18%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #15857      +/-   ##
==========================================
+ Coverage   90.98%   91.17%   +0.18%     
==========================================
  Files         143      108      -35     
  Lines       49443    47584    -1859     
==========================================
- Hits        44985    43383    -1602     
+ Misses       4458     4201     -257

Flag	Coverage Δ
#multiple	88.94% <ø> (+0.22%)	⬆️
#single	40.81% <ø> (+0.04%)	⬆️

Impacted Files	Coverage Δ
pandas/io/gbq.py	25% <0%> (-58.34%)	⬇️
pandas/io/msgpack/exceptions.py	77.27% <0%> (-6.07%)	⬇️
pandas/core/index.py	95.42% <0%> (-4.58%)	⬇️
pandas/computation/ops.py	93.95% <0%> (-1.65%)	⬇️
pandas/computation/api.py	98.92% <0%> (-1.08%)	⬇️
pandas/core/frame.py	97.23% <0%> (-0.43%)	⬇️
pandas/types/generic.py
pandas/io/msgpack/_version.py
pandas/core/sparse.py
pandas/tseries/plotting.py
... and 69 more

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