Use "Black" as code style fixer to harmonize coding style

Use a code style fixer among contributions to have one unique code style.

Try to use this one :

https://github.com/ambv/black

Black requires Python 3.6+

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changed title from Use "Black" as code style fixer to harmonize coding style to Use "Black" as code style fixer to harmonize coding style (python 3.6)

DuniterPy does not require Python 3.6 to be formatted by Black.

It is Black which requires Python 3.6.

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