[perl #130919] Supplier.done is only handled by first tap

[brian d foy]

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The .done method of a Supplier should call all the done handlers in
all the taps that have one. I don't think that's happening in 2017.01.

It looks like only the first .tap gets to the done message:

    my $supplier = Supplier.new;
    my $supply   = $supplier.Supply;

    $supply.tap(
        done => { put "1. Done" },
        );
    $supply.tap(
        done => { put "2. Done" },
        );

    $supplier.done; # output only first

I get just the first handler:

    1. Done

And, if the first .tap does not have a done handler, I get no
output:

    my $supplier = Supplier.new;
    my $supply   = $supplier.Supply;

    $supply.tap(
        );
    $supply.tap(
        done => { put "2. Done" },
        );

    $supplier.done;  # no output