Add 2 missing instances in ZifyBool.v
Add 2 missing instances in ZifyBool.v

Matafou/coq,SkySkimmer/coq,Zimmi48/coq,JasonGross/coq,coq/coq,SkySkimmer/coq,Zimmi48/coq,silene/coq,ejgallego/coq,silene/coq,coq/coq,coq/coq,coq/coq,gares/coq,ejgallego/coq,gares/coq,Matafou/coq,Matafou/coq,silene/coq,JasonGross/coq,gares/coq,ejgallego/coq,SkySkimmer/coq,Zimmi48/coq,gares/coq,JasonGross/coq,Zimmi48/coq,gares/coq,JasonGross/coq,ejgallego/coq,SkySkimmer/coq