Fix default value of loglevel

Author: Nikita Voronchev

pytest_reportportal/service.py

@@ -144,7 +144,7 @@ def _get_top_id_from_stack(self):
         except IndexError:
             return None
 
-    def post_log(self, message, log_level="INFO"):
+    def post_log(self, message, log_level=logging.INFO):
         sl_rq = SaveLogRQ(item_id=self._get_top_id_from_stack(),
                           time=timestamp(), message=message,
                           level=self.loglevel_map[log_level])