Docker installation update

[eddiebergman]

Updates the command basedon this comment so it should work for Linux and Windows users. Unix systems should be able to identify that in the full string $PWD:/opt/nb that $PWD is the environment variable. If it's broken on Windows and requires the ${} escape then it seems Windows does not recognize it.

Before as just $PWD:

docker run -it -v $PWD:/opt/nb -p 8888:8888 mfeurer/auto-sklearn:master /bin/bash -c "mkdir -p /opt/nb && jupyter notebook --notebook-dir=/opt/nb --ip='0.0.0.0' --port=8888 --no-browser --allow-root"

After as ${PWD}:

docker run -it -v ${PWD}:/opt/nb -p 8888:8888 mfeurer/auto-sklearn:master /bin/bash -c "mkdir -p /opt/nb && jupyter notebook --notebook-dir=/opt/nb --ip='0.0.0.0' --port=8888 --no-browser --allow-root"

[codecov]

Codecov Report

Merging #1235 (904dda7) into development (19a9573) will increase coverage by 0.03%.
The diff coverage is n/a.

@@               Coverage Diff               @@
##           development    #1235      +/-   ##
===============================================
+ Coverage        88.20%   88.23%   +0.03%     
===============================================
  Files              139      139              
  Lines            11037    11037              
===============================================
+ Hits              9735     9739       +4     
+ Misses            1302     1298       -4     

Impacted Files	Coverage Δ
autosklearn/pipeline/implementations/util.py	81.25% <0.00%> (-3.13%)	⬇️
...ine/components/classification/gradient_boosting.py	93.91% <0.00%> (+0.86%)	⬆️
...learn/pipeline/components/regression/libsvm_svr.py	91.46% <0.00%> (+1.21%)	⬆️
...eline/components/feature_preprocessing/fast_ica.py	97.82% <0.00%> (+6.52%)	⬆️

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