Don't run on MacOS 10.15

[wizz777]

soapy_power -info Traceback (most recent call last): File "/Library/Frameworks/Python.framework/Versions/3.7/bin/soapy_power", line 11, in load_entry_point('soapy-power==1.6.1', 'console_scripts', 'soapy_power')() File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/pkg_resources/init.py", line 489, in load_entry_point return get_distribution(dist).load_entry_point(group, name) File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/pkg_resources/init.py", line 2852, in load_entry_point return ep.load() File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/pkg_resources/init.py", line 2443, in load return self.resolve() File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/pkg_resources/init.py", line 2449, in resolve module = import(self.module_name, fromlist=['name'], level=0) File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/soapy_power-1.6.1-py3.7.egg/soapypower/main.py", line 5, in File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/SimpleSoapy-1.5.1-py3.7.egg/simplesoapy.py", line 5, in File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/SoapySDR.py", line 28, in import _SoapySDR ImportError: dynamic module does not define module export function (PyInit__SoapySDR)