remove Auth header on InvalidToken exception

trading_ig/rest.py

@@ -112,6 +112,7 @@ def create(self, endpoint, params, session, version):
                 raise ApiExceededException()
             if token_invalid(response.text):
                 logger.warning("Invalid session token, triggering refresh...")
+                del self.session.headers["Authorization"]
                 raise TokenInvalidException()
             if "error.public-api.failure.kyc.required" in response.text:
                 raise KycRequiredException(