Update besapi.py

fix issue with tuples

src/besapi/besapi.py

@@ -352,7 +352,7 @@ def session_relevance_array(self, relevance, **kwargs):
 
     def session_relevance_string(self, relevance, **kwargs):
         """Get Session Relevance Results string"""
-        rel_result_array = self.session_relevance_array(relevance, **kwargs)
+        rel_result_array = self.session_relevance_array("(it as string) of " + relevance, **kwargs)
         return "\n".join(rel_result_array)
 
     def login(self):