Tango CLI doesn't work on Colab

[AkshitaB]

pip installing tango on Google Colab works for imports. But the cli commands result in error:

!tango --version

Error:

  File "/usr/local/bin/tango", line 5, in <module>
    from tango.__main__ import main
  File "/usr/local/lib/python3.7/dist-packages/tango/__main__.py", line 221, in <module>
    @main.result_callback()
TypeError: 'NoneType' object is not callable```