Python 3.9 compatibility

[lucasrodes]

Python 3.9 is on its way. whatstk should be tested so as to make it compatible with it.

References:

• What’s New In Python 3.9
• PEP 596 -- Python 3.9 Release Schedule

[lucasrodes]

As this packet depends on several, python 3.9 support from these libraries is a requirement:

• numpy (currently v1.19.3): supports python 3.9. pip install works.
• pandas (currently v1.1.4): supports python 3.9. pip install works.
• emoji (currently v0.6.0). not specified. pip install works.
• plotly (currently v4.12.0): No according to pyreadiness. pip install works.
• python-lorem (currently v1.1.2): not specified. pip install works.
• scipy (currently v1.5.3): No according to pyreadiness. To be released soon. pip install does not works.
• seaborn (currently v0.11.0): No according to pyreadiness. pip install works.
• certifi (currently v2020.6.20): No according to pyreadiness. To be released soon. pip install works.

[lucasrodes]

As of today, the following dependencies are compatible with python 3.7, 3.8, and 3.9. 3.6 support removed.

emoji==0.6.0
numpy==1.19.5
pandas==1.2.0
plotly==4.14.3
python-lorem==1.1.2
scipy==1.6.0
seaborn==0.11.1
certifi==2020.12.5