DOC: added google finance as a data source to the DataReader doc
DOC: corrected cookbook.rst example on reversing timeseries
BUG: GH4516 Fixed issue with sorting a duplicate multi-index that has multiple dtypes
Merge pull request #4518 from mehyar/doc_datareader

DOC: added google finance as a data source to the DataReader doc
Merge pull request #4522 from jreback/mi_dups

BUG: GH4516 Fixed issue with sorting a duplicate multi-index that has multiple dtypes
DOC: add more docs to CONTRIBUTING