Set minimum required version for click

[Abraham Murciano]

condax is not compatible with some old versions of click.

For example, I have click 7.0 installed with condax 0.1.1, and condax gives this output for any command:

❯ condax --version
Traceback (most recent call last):

  File "/homes/abrahamm/.local/bin/condax", line 10, in <module>
    sys.exit(cli())

TypeError: __init__() got an unexpected keyword argument 'no_args_is_help'