Remove suggestion to wait for Star releases
Remove suggestion to wait for Star releases

- Only 25% of users use Star, so waiting for something is requesting
bookkeeping (i.e. trying not to forget to document it when the time
comes) for the benefit of a minority of users. 
- "technically" the stuff in the docs is meant to be compiler-neutral, so it's
very weird to have a CONTRIBUTING instruction that indicates
a specific distribution of a specific compiler
tbrowder/doc,perl6/doc,jonathanstowe/doc,perl6/doc,MasterDuke17/doc,jonathanstowe/doc,stmuk/doc,tbrowder/doc,dmaestro/doc,dmaestro/doc,perl6/doc,stmuk/doc,dmaestro/doc,perl6/doc,stmuk/doc,jonathanstowe/doc,perl6/doc,stmuk/doc,tbrowder/doc,MasterDuke17/doc,MasterDuke17/doc,stmuk/doc,dmaestro/doc,jonathanstowe/doc,tbrowder/doc,MasterDuke17/doc,jonathanstowe/doc,dmaestro/doc