Fix linear bug

Merge pull request shap#1354 from imatiach-msft/ilmat/python3.8

add python 3.8 wheel for releases

Merge branch 'master' of https://github.com/slundberg/shap

Merge pull request shap#962 from SimonStreicher/master

Allows retaining original class order in multi-class summary plot

Bump version to 0.33

Add releases to travis

Bump version

Merge pull request shap#808 from gabrieltseng/linear_intercept

Handle the multiclass case with no intercept

Create Example of loading a custom tree model into SHAP.ipynb

Enable better direct loading of tree models from dictionaries