fix: Send the FDv2 polling selector as the "basis" query parameter

Author: jsonbailey

ldclient/impl/datasourcev2/async_polling.py

@@ -185,7 +185,7 @@ async def fetch(self, selector: Optional[Selector]) -> PollingResult:
             query_params["filter"] = self._config.payload_filter_key
 
         if selector is not None and selector.is_defined():
-            query_params["selector"] = selector.state
+            query_params["basis"] = selector.state
 
         uri = self._poll_uri
         if len(query_params) > 0:

ldclient/impl/datasourcev2/polling.py

@@ -165,7 +165,7 @@ def fetch(self, selector: Optional[Selector]) -> PollingResult:
             query_params["filter"] = self._config.payload_filter_key
 
         if selector is not None and selector.is_defined():
-            query_params["selector"] = selector.state
+            query_params["basis"] = selector.state
 
         uri = self._poll_uri
         if len(query_params) > 0: