Removed governance announcement from README
Removed governance announcement from README

The linked issue has now been closed for over four months, so the new
governance model is no longer that new. Additionally, it seems that most
people don't read the announcement anyway, because I still get a fair
amount of tweets and such about AutoFixture...

sergeyshushlyapin/AutoFixture,zvirja/AutoFixture,AutoFixture/AutoFixture,Pvlerick/AutoFixture,sean-gilliam/AutoFixture,sergeyshushlyapin/AutoFixture