Project slug not accepted

[jayvdb]

I suspect I am supposed to use -o jayvdb -p flake8-putty, but some input validation should prevent /, or just allow the user to use slugs to simplify the cli.

> /usr/bin/githubcap-cli issues-listing -p jayvdb/flake8-putty
2020-01-07 13:05:37,966 [4529] CRITICAL root: Traceback (most recent call last):
  File "/usr/lib/python3.7/site-packages/githubcap/base.py", line 64, in call
    response.raise_for_status()
  File "/home/jayvdb/.local/lib/python3.7/site-packages/requests/models.py", line 940, in raise_for_status
    raise HTTPError(http_error_msg, response=self)
requests.exceptions.HTTPError: 404 Client Error: Not Found for url: https://api.github.com/repos/None/jayvdb/flake8-putty/issues?page=1&per_page=100&filter=all&state=all&sort=created&direction=desc&milestone=*&assignee=*

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/bin/githubcap-cli", line 11, in <module>
    load_entry_point('githubcap==0.0.0', 'console_scripts', 'githubcap-cli')()
  File "/usr/lib/python3.7/site-packages/click/core.py", line 764, in __call__
    return self.main(*args, **kwargs)
  File "/usr/lib/python3.7/site-packages/click/core.py", line 717, in main
    rv = self.invoke(ctx)
  File "/usr/lib/python3.7/site-packages/click/core.py", line 1137, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/usr/lib/python3.7/site-packages/click/core.py", line 956, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/usr/lib/python3.7/site-packages/click/core.py", line 555, in invoke
    return callback(*args, **kwargs)
  File "/usr/lib/python3.7/site-packages/githubcap/cli.py", line 172, in issues_listing
    _print_result(list(reported_issues), not no_pretty)
  File "/usr/lib/python3.7/site-packages/githubcap/resources/issues.py", line 70, in list_issues
    for item in self._do_listing(base_uri):
  File "/usr/lib/python3.7/site-packages/githubcap/base.py", line 97, in _do_listing
    response, headers = self.get(uri)
  File "/usr/lib/python3.7/site-packages/githubcap/base.py", line 76, in get
    return cls.call(*args, **kwargs, method='GET')
  File "/usr/lib/python3.7/site-packages/githubcap/base.py", line 66, in call
    raise HTTPError(response.json(), response.status_code) from exc
githubcap.exceptions.HTTPError: Not Found

When I do use -o/-p combo, I get no results

> /usr/bin/githubcap-cli -t ... issues-listing -o jayvdb -p flake8-putty
[]