Added a warning as a TODO.
Added a warning as a TODO.

StevenJiang2015/AutoFixture,yuva2achieve/AutoFixture,dlongest/AutoFixture,amarant/AutoFixture,Pvlerick/AutoFixture,dlongest/AutoFixture,AutoFixture/AutoFixture,dcastro/AutoFixture,StevenJiang2015/AutoFixture,olegsych/AutoFixture,sbrockway/AutoFixture,sbrockway/AutoFixture,adamchester/AutoFixture,amarant/AutoFixture,olegsych/AutoFixture,yuva2achieve/AutoFixture,mrinaldi/AutoFixture,sergeyshushlyapin/AutoFixture,dcastro/AutoFixture,mrinaldi/AutoFixture,zvirja/AutoFixture,hackle/AutoFixture,hackle/AutoFixture,sean-gilliam/AutoFixture,sergeyshushlyapin/AutoFixture,adamchester/AutoFixture