Add pytorch 1.6 CI

[xvjiarui]

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[codecov]

Codecov Report

Merging #64 into master will decrease coverage by 0.12%.
The diff coverage is 74.07%.

@@            Coverage Diff             @@
##           master      #64      +/-   ##
==========================================
- Coverage   81.50%   81.38%   -0.13%     
==========================================
  Files          71       72       +1     
  Lines        3158     3191      +33     
  Branches      493      500       +7     
==========================================
+ Hits         2574     2597      +23     
- Misses        496      504       +8     
- Partials       88       90       +2     

Flag	Coverage Δ
#unittests	81.38% <74.07%> (-0.13%)	⬇️

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Impacted Files	Coverage Δ
mmseg/models/decode_heads/decode_head.py	91.66% <0.00%> (ø)
mmseg/utils/collect_env.py	21.15% <50.00%> (ø)
mmseg/version.py	58.33% <58.33%> (ø)
mmseg/__init__.py	73.68% <73.68%> (-26.32%)	⬇️
mmseg/core/seg/sampler/ohem_pixel_sampler.py	94.59% <90.00%> (+0.65%)	⬆️

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