Hi

Since ARMmbed/mbed-os#8542,
python modules version check is more strict.
But I think this doesn't really work ?

1. missing module check

In my environment, urllib3 is installed.
But if I print pkg here:

=> I always got urllib3[secure]

2. module version check

"pip install -r requirements.txt" command is executed only if "missing" is not empty:

=> this means that if each package is present, module version is not checked
and ARMmbed/mbed-os#8542 is not useful?