Stop the store after we have shutdown the poller to avoid potential errors

Author: jsonbailey

lib/ldclient-rb/impl/data_store/feature_store_client_wrapper.rb

@@ -67,8 +67,6 @@ def initialized?
 
         # (see LaunchDarkly::Interfaces::FeatureStore#stop)
         def stop
-          @store.stop
-
           poller_to_stop = nil
 
           @mutex.synchronize do
@@ -80,6 +78,8 @@ def stop
           end
 
           poller_to_stop.stop if poller_to_stop
+
+          @store.stop
         end
 
         #