[S2GRAPH-230] ResourceManager onEvict cause segmentation fault with AnnoyModelFetcher

JIRA:
  [S2GRAPH-230] https://issues.apache.org/jira/browse/S2GRAPH-230

Pull Request:
  Closes #179

Author
  DO YUNG YOON <steamshon@apache.org>
diff --git a/CHANGES b/CHANGES
index 0595ad5..734f498 100644
--- a/CHANGES
+++ b/CHANGES
@@ -83,6 +83,7 @@
     * [S2GRAPH-214] - Add REAME for movielens examples
     * [S2GRAPH-216] - Provide a transform directive in the GraphQL query result.
     * [S2GRAPH-221] - Unify configurations for bulk and mutate in S2GraphSink.
+    * [S2GRAPH-230] - ResourceManager onEvict cause segmentation fault with AnnoyModelFetcher 
     * [S2GRAPH-231] - Change the GraphQL type name to a valid string.
 
 ** New Feature