Describe the bug
I have cookies in the cookie jar. When I try to create a tag that "references a cookie value from the cookie jar", it tells me there are no cookies for that url.

To Reproduce

• Add a tag
• Select Cookie
• Type any url that matches something in the cookie jar

Expected behavior
I should be able to choose a cookie from that jar

Screenshots
![cookies](ht

I expect

• to add some tests in https://github.com/ioggstream/openapi-resolver/blob/master/tests/test_cases.py
  for testing https://github.com/ioggstream/openapi-resolver/blob/master/openapi_resolver/__main__.py

Tests could just verify that main() works as expected.