Changed local link to testimonials,
Changed local link to testimonials,

since it seems that GitHub auto-generates local anchors from headlines, e.g. "#who-uses-autofixture"...
sbrockway/AutoFixture,Pvlerick/AutoFixture,dlongest/AutoFixture,olegsych/AutoFixture,mrinaldi/AutoFixture,adamchester/AutoFixture,dcastro/AutoFixture,sean-gilliam/AutoFixture,olegsych/AutoFixture,dcastro/AutoFixture,dlongest/AutoFixture,StevenJiang2015/AutoFixture,mrinaldi/AutoFixture,StevenJiang2015/AutoFixture,yuva2achieve/AutoFixture,hackle/AutoFixture,yuva2achieve/AutoFixture,amarant/AutoFixture,adamchester/AutoFixture,hackle/AutoFixture,amarant/AutoFixture,zvirja/AutoFixture,sbrockway/AutoFixture,sergeyshushlyapin/AutoFixture,sergeyshushlyapin/AutoFixture,AutoFixture/AutoFixture