[Petal] bug: documentation uses unsupported (but TAL spec) modifier

[Jonathan Vanasco]

actually, i realized a more elegant solution-

lib/Petal/Hash.pm
(  add this  line @72 )
=====
$MODIFIERS->{'not:'} = $MODIFIERS->{'false:'};
=====

that uses the same approach as the rest of Petal.  I was tired and  
didn't notice that would work earlier.

sorry for suggesting  a poor patch earlier.