Update changelog

changelog

@@ -38,4 +38,5 @@
 0.21: added parsing of 'logical-systems' (DBOARD3-150)
 0.22: return a skeleton response for unknown interfaces (DBOARD3-169)
 0.23: use redis pipelines where possible
-0.24: optimization, don't do aggressive checking when deleting during rebuilding
+0.24: optimization, don't do aggressive pre-delete checking rebuilding
+0.25: propagate errors when waiting for tasks to complete