Remove taps/tappers

Author: jonathanstowe

doc/Type/Supply.pod

@@ -89,17 +89,6 @@ a time.
 
 =head1 Utility methods
 
-=head2 method taps
-
-    method taps(Supply:D:) returns Int:D
-
-Returns the number of taps.
-
-    my $s = Supply.new;
-    say $s.taps;    # 0
-    $s.tap(&sqrt);
-    say $s.taps;    # 1
-
 =head2 method Channel
 
     method Channel(Supply:D:) returns Channel:D
@@ -128,12 +117,6 @@ or quit before a value arrived.
 Closes the given tap, this is, calls its C<close> callback (if any), and
 prevents it from getting any more values flowing through the supply.
 
-=head2 method tappers
-
-    method tappers(Supply:D:) returns List:D
-
-Returns a list of taps as L<Tap|/type/Tap> objects.
-
 =head2 method live
 
     method live(Supply:D:) returns Bool:D