Fix deprecation warnings

[lanpa]

numpy/numpy#10615

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (9d51d9a) 84.83% compared to head (bca85a9) 84.83%.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #703   +/-   ##
=======================================
  Coverage   84.83%   84.83%           
=======================================
  Files          36       36           
  Lines        2104     2104           
=======================================
  Hits         1785     1785           
  Misses        319      319           

Impacted Files	Coverage Δ
tensorboardX/writer.py	86.41% <ø> (ø)
tensorboardX/summary.py	86.71% <100.00%> (ø)

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