Inform setuptools that this is a binary package (#1996)
Inform setuptools that this is a binary package (#1996)

* Inform setuptools that this is a binary package that needs platform-tags in wheel names.

This fixes issue #1995 .

* PEP8 Formatting

* Add docstring

dmlc/xgboost,dmlc/xgboost,dmlc/xgboost,dmlc/xgboost,dmlc/xgboost,dmlc/xgboost