SHAPforxgboost 0.0.2

• Added a NEWS.md file to track changes to the package.
• 07/30/2019 Version 0.0.1 uploaded to cran.
• 08/10/2019 Version 0.0.2 released with update, fixed some bugs with dilute.
• 08/27/2019 Major change, merged function shap.plot.dependence.color into shap.plot.dependence.

SHAPforxgboost 0.0.3

• 01/22/2020 I realized that I did not watch my own repo, I fixed some issues raised, for example, y-axis goes under the data instead of on it.
  
• 02/08/2020 Added an var_cat option to shap.prep so if supply a categorical variable, the long-format data would use var_cat as a labelling variable. For example, we can make two summary plot by adding facet_wrap(~ var_cat) to the shap.plot.summary .
• Added an ID variable for each observation to the dataset produced by shap.prep and shap.prep.stack.data, which might be useful under certain situation.
  
• Revised most functions’ documentations.