BUG: Close the request session after its use

This is mostly to get rid of a Python ResourceWarning about an unclosed
ssl socket, but it is also more clean. In the future this should
probably be move to a teardown() function.

Author: Birger Schacht

intelmq/bots/experts/national_cert_contact_certat/expert.py

@@ -51,6 +51,7 @@ def process(self):
                     'sep': 'semicolon',
                 }
                 req = self.session.get(URL, params=parameters)
+                self.session.close()
                 if not req.text:
                     # empty response
                     continue