Version check fails in spynnaker8/setup_pynn.py

[Martin Schulze]

The install script spynnaker8/setup_pynn.py fails with PyNN 0.9.0 as the comparison implemented in 'version_satisfies' compares only greater than but I think it should be greater-equal as follows:

return Version(module.__version__) >= Version(requirement)

[Andrew Gait]

Thanks @uahic for noticing this and suggesting the fix.