[S2GRAPH-251] Provide JdbcSource/Sink

JIRA:
  [S2GRAPH-251] https://issues.apache.org/jira/browse/S2GRAPH-251

Pull Request:
  Closes #194

Author
  Chul Kang <elric@apache.org>
diff --git a/CHANGES b/CHANGES
index 56b78fe..26388ab 100644
--- a/CHANGES
+++ b/CHANGES
@@ -39,6 +39,7 @@
     * [S2GRAPH-201] - Provide S2GraphSource
     * [S2GRAPH-218] - add operations not supported on sql
     * [S2GRAPH-225] - support custom udf class
+    * [S2GRAPH-251] - Provide JdbcSource/Sink
 
 ** Bug
     * [S2GRAPH-159] - Wrong syntax at a bash script under Linux