Add hardcoded pip dependency versions

[dhenschen]

Prior to this pull request, The Travis CI and local unit test suites were failing (see https://travis-ci.org/digidotcom/python-wpa-supplicant/builds/454696189). All of the unit test failures were related to version incompatibility issues with new pip dependencies.

This pull request adds explicit package versions of click and Twisted. The versions used are from the most passing Travis CI job at: https://travis-ci.org/digidotcom/python-wpa-supplicant/builds/248812490

[rogerlucas-veea]

Please can you merge this? The code is broken at the moment as the default packages pulled in are currently click 7.0 and Twisted 19.10.0...
When I run the CLI, I get the following errors reported:

Traceback (most recent call last):
  File "/home/pi/.local/lib/python3.7/site-packages/wpa_supplicant/cli.py", line 85, in <module>
    @click.pass_context
  File "/usr/lib/python3/dist-packages/click/decorators.py", line 151, in decorator
    _param_memo(f, ArgumentClass(param_decls, **attrs))
  File "/usr/lib/python3/dist-packages/click/core.py", line 1808, in __init__
    Parameter.__init__(self, param_decls, required=required, **attrs)
  File "/usr/lib/python3/dist-packages/click/core.py", line 1338, in __init__
    self._parse_decls(param_decls or (), expose_value)
  File "/usr/lib/python3/dist-packages/click/core.py", line 1841, in _parse_decls
    'parameter declaration, got %d' % len(decls))
TypeError: Arguments take exactly one parameter declaration, got 2

With click 6.7 and twisted 17.5.0, it works.

Click 6.7 resolves the above error. Other errors occur later such as:

Interface(Path: /fi/w1/wpa_supplicant1/Interfaces/1, Name: wlan0, State: disconnected)
OK
Traceback (most recent call last):
  File "/home/pi/.local/lib/python3.7/site-packages/wpa_supplicant/cli.py", line 277, in <module>
    run()
  File "/home/pi/.local/lib/python3.7/site-packages/wpa_supplicant/cli.py", line 273, in run
    root()
  File "/home/pi/.local/lib/python3.7/site-packages/click/core.py", line 722, in __call__
    return self.main(*args, **kwargs)
  File "/home/pi/.local/lib/python3.7/site-packages/click/core.py", line 697, in main
    rv = self.invoke(ctx)
  File "/home/pi/.local/lib/python3.7/site-packages/click/core.py", line 1066, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/home/pi/.local/lib/python3.7/site-packages/click/core.py", line 895, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/home/pi/.local/lib/python3.7/site-packages/click/core.py", line 535, in invoke
    return callback(*args, **kwargs)
  File "/home/pi/.local/lib/python3.7/site-packages/wpa_supplicant/cli.py", line 177, in get_interface
    pprint.pprint(supp.get_interface(ifname))
  File "/usr/lib/python3.7/contextlib.py", line 119, in __exit__
    next(self.gen)
  File "/home/pi/.local/lib/python3.7/site-packages/wpa_supplicant/cli.py", line 38, in supplicant
    reactor.sigTerm()
  File "/home/pi/.local/lib/python3.7/site-packages/twisted/internet/base.py", line 696, in sigTerm
    self._exitSignal = args[0]
IndexError: tuple index out of range

which are resolved by installing Twisted 17.5.0.

[posborne]

@brandonmoser Can you help get this merged? ideally we would like a set of active maintainers on this project with the commit bit. Alternatively we can work out where to move the repo / setup a maintained fork outside of this org.