Warn about vendor versions less than 2015.12 since the code fragment to do this was deleted.
Warn about vendor versions less than 2015.12 since the code fragment to
do this was deleted.

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