Revert "Remove IO::Path.watch"
Revert "Remove IO::Path.watch"

This reverts commit ef9f453d5ab4b3fc4637830c4b5ab3ee003088a8.

Per: https://irclog.perlgeek.de/perl6/2017-05-28#i_14650194

jonathanstowe/doc,antquinonez/doc,stmuk/doc,stmuk/doc,stmuk/doc,jonathanstowe/doc,MasterDuke17/doc,perl6/doc,MasterDuke17/doc,stmuk/doc,perl6/doc,gfldex/doc,MasterDuke17/doc,antquinonez/doc,dmaestro/doc,jonathanstowe/doc,tbrowder/doc,dmaestro/doc,tbrowder/doc,antquinonez/doc,perl6/doc,dmaestro/doc,antquinonez/doc,gfldex/doc,gfldex/doc,gfldex/doc,jonathanstowe/doc,perl6/doc,perl6/doc,antquinonez/doc,jonathanstowe/doc,gfldex/doc,dmaestro/doc,tbrowder/doc,dmaestro/doc,stmuk/doc,tbrowder/doc,MasterDuke17/doc