Use default cacert

Uses the default cacert (e.g. set via s = requests.Sessions(), s.verify = cacert) when it's not passed in via s.get(url, verify=cacert).

requests/sessions.py

@@ -541,7 +541,7 @@ def get(self, url, **kwargs):
         :param \*\*kwargs: Optional arguments that ``request`` takes.
         :rtype: requests.Response
         """
-
+        kawrgs.setdefault('verify', self.verify)
         kwargs.setdefault('allow_redirects', True)
         return self.request('GET', url, **kwargs)