Include id_ed25519 in the known default identity files

Change-Id: I9fb30c8fbb65536782ee73644c8990eb6661c660
Signed-off-by: Thomas Wolf <thomas.wolf@paranor.ch>

org.eclipse.jgit/src/org/eclipse/jgit/transport/SshConstants.java

@@ -197,6 +197,6 @@ public final class SshConstants {
 
 	/** All known default identity file names. */
 	public static final String[] DEFAULT_IDENTITIES = { //
-			ID_RSA, ID_DSA, ID_ECDSA // , ID_ED25519 // not yet...
+			ID_RSA, ID_DSA, ID_ECDSA, ID_ED25519
 	};
 }