Add a missing @since tag

Change-Id: Ie34a4a9c4c47c2f27579094d74a7849fc26a323b

org.eclipse.jgit/src/org/eclipse/jgit/dircache/DirCacheEntry.java

@@ -638,6 +638,7 @@ public class DirCacheEntry {
 	 * Get a copy of the entry's raw path bytes.
 	 *
 	 * @return raw path bytes.
+	 * @since 3.3
 	 */
 	public byte[] getRawPath() {
 		return path.clone();