more diagnostics

Author: coke

util/update-and-test

@@ -23,6 +23,7 @@ my $new-rev = get-rev;
 if $old-rev eq $new-rev {
     say "No changes to test.";
 } else {
+    say "Updating prerequisites";
     run(<zef install --deps-only .>);
 
     my $revs = $old-rev ~ ".." ~ $new-rev;