Support ResNeSt backbone

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[codecov]

Codecov Report

Merging #47 into master will decrease coverage by 0.00%.
The diff coverage is 80.41%.

@@            Coverage Diff             @@
##           master      #47      +/-   ##
==========================================
- Coverage   81.41%   81.40%   -0.01%     
==========================================
  Files          71       73       +2     
  Lines        3158     3324     +166     
  Branches      493      515      +22     
==========================================
+ Hits         2571     2706     +135     
- Misses        497      517      +20     
- Partials       90      101      +11     

Flag	Coverage Δ
#unittests	81.40% <80.41%> (-0.01%)	⬇️

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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/models/segmentors/encoder_decoder.py	88.59% <62.50%> (-1.83%)	⬇️
mmseg/__init__.py	73.68% <73.68%> (-26.32%)	⬇️
mmseg/models/backbones/resnest.py	83.72% <83.72%> (ø)
mmseg/core/seg/sampler/ohem_pixel_sampler.py	94.59% <90.00%> (+0.65%)	⬆️
mmseg/models/backbones/__init__.py	100.00% <100.00%> (ø)
mmseg/models/utils/res_layer.py	100.00% <100.00%> (ø)
... and 2 more

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