Update version to 6.0.0
Update version to 6.0.0

nviennot/mongoid,nicolasblanco/mongoid,jonhyman/mongoid,Welovroi/mongoid,rinmu/mongoid,mongodb/mongoid,Zhomart/mongoid,Sharevari-Inc/mongoid,rinmu/mongoid,jonhyman/mongoid,jbrien/mongoid,Welovroi/mongoid,kay-kim/mongoid,mongodb/mongoid,nviennot/mongoid,herimedia/mongoid,Zhomart/mongoid,herimedia/mongoid,Sharevari-Inc/mongoid,estolfo/mongoid,uniiverse/mongoid,kay-kim/mongoid,mongodb/mongoid,estolfo/mongoid,uniiverse/mongoid,jbrien/mongoid