ByteBufferInputStream: add missing @since 6.8

Change-Id: I80574a514ade608b87bed2dae79851e53a850c31
Signed-off-by: Thomas Wolf <twolf@apache.org>
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/util/io/ByteBufferInputStream.java b/org.eclipse.jgit/src/org/eclipse/jgit/util/io/ByteBufferInputStream.java
index 9c00329..804f7f8 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/util/io/ByteBufferInputStream.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/util/io/ByteBufferInputStream.java
@@ -21,6 +21,8 @@
 
 /**
  * An {@link InputStream} backed by a {@link ByteBuffer}.
+ *
+ * @since 6.8
  */
 public class ByteBufferInputStream extends InputStream {