install.sh supports only python3.7 not python3.8

[danistrigaro]

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Describe the problem

In the install.sh file is specified that one of the required libraries is: libpython3.7-dev That caused issue if you want to install the library with Python 3.8 which seems to be supported looking at the following lines of code where you check the python version.

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[DomAmato]

This is related to your other issue #54 as there is a reason we only target 3.7 at the moment.