TA-Lib install broken in CI

[cjdsellers]

Looks like something changed with ta-lib and the Python installation is currently broken:
TA-Lib/ta-lib-python#655

It appears two test modules are currently commented out:
https://github.com/nautechsystems/nautilus_trader/blob/develop/tests/unit_tests/indicators/test_talib_func_wrapper.py
https://github.com/nautechsystems/nautilus_trader/blob/develop/tests/unit_tests/indicators/test_talib_indicator_manager.py

Once ta-lib resolve this we can resume the installation step and tests in CI.

[cjdsellers]

Hey @rsmb7z

Do we know if the TA-Lib installation issues have been resolved on their end?

[rsmb7z]

Hi @cjdsellers,
I'll work on it this week. I'll likely remove the TA-Lib dependency from the tests and use mocks instead, as we're focusing on testing the manager class, not the TA-Lib itself.