Silence API error caused by changed return type of digest()

Change-Id: Ic0810ed7fea837c45cbc9a4649ca51d140bad6e6
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

org.eclipse.jgit/.settings/.api_filters

@@ -8,6 +8,14 @@
             </message_arguments>
         </filter>
     </resource>
+    <resource path="src/org/eclipse/jgit/lib/ObjectInserter.java" type="org.eclipse.jgit.lib.ObjectInserter">
+        <filter comment="changed return type of digest() breaking implementors which is ok in minor releases according to OSGi semantic versioning" id="338792546">
+            <message_arguments>
+                <message_argument value="org.eclipse.jgit.lib.ObjectInserter"/>
+                <message_argument value="digest()"/>
+            </message_arguments>
+        </filter>
+    </resource>
     <resource path="src/org/eclipse/jgit/transport/http/HttpConnection.java" type="org.eclipse.jgit.transport.http.HttpConnection">
         <filter comment="OSGi semantic versioning rules allow to break implementors in minor releases" id="403767336">
             <message_arguments>

org.eclipse.jgit/src/org/eclipse/jgit/lib/ObjectInserter.java

@@ -217,7 +217,10 @@ public abstract class ObjectInserter implements AutoCloseable {
 		return b;
 	}
 
-	/** @return digest to help compute an ObjectId */
+	/**
+	 * @return digest to help compute an ObjectId
+	 * @since 4.7
+	 */
 	protected SHA1 digest() {
 		return hasher.reset();
 	}