Add a case statement for fast-forward merge

This case was ommitted. Treat the same as a non-fastworwad
merge.

Change-Id: Ia81e2430dfe04c3ce9b6e2f8fb4b6c646293a174

org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/Merge.java

@@ -161,6 +161,7 @@ class Merge extends TextBuiltin {
 			outw.println(MessageFormat.format(CLIText.get().mergeMadeBy, name));
 			break;
 		case MERGED_SQUASHED:
+		case FAST_FORWARD_SQUASHED:
 			outw.println(CLIText.get().mergedSquashed);
 			break;
 		case ABORTED: