Fix call to requests, set user agent in headers

Author: gmazoyer

pyixapi/core/query.py

@@ -127,6 +127,9 @@ def _make_call(self, verb="get", url_override=None, add_params=None, data=None):
         if self.token:
             headers["Authorization"] = f"Bearer {self.token}"
 
+        if self.user_agent:
+            headers["User-Agent"] = self.user_agent
+
         params = {}
         if not url_override:
             if self.filters:
@@ -139,7 +142,6 @@ def _make_call(self, verb="get", url_override=None, add_params=None, data=None):
             headers=headers,
             params=params,
             json=data,
-            user_agent=self.user_agent,
             proxies=self.proxies,
         )