Merge pull request griddb#21 from dangtrungtin/master

Add support for Python 3.9 and SWIG 4.0.2

Merge pull request griddb#19 from dangtrungtin/master

Improve peformances put/get rows using pandas.DataFrame

add Windows

add Ubuntu

update for 0.8.1

add comment and reformat

correct the comparison sentence for numRowOfCountainer

replace gsGetRowFieldGeneral() as gsGetRowFieldAsXXX()

change version message

update for V4.0 CE