Replace deprecated release() methods by close() in NoteMapMerger

Change-Id: Iaa76f0e853bb82cd7f231fd2f462a319f4196d8c
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

org.eclipse.jgit/src/org/eclipse/jgit/notes/NoteMapMerger.java

@@ -135,8 +135,8 @@ public class NoteMapMerger {
 			inserter.flush();
 			return NoteMap.newMap(mergedBucket, reader);
 		} finally {
-			reader.release();
-			inserter.release();
+			reader.close();
+			inserter.close();
 		}
 	}