Make __isPromisified__ nonenumerable
Make __isPromisified__ nonenumerable

petkaantonov/bluebird,petkaantonov/bluebird,yonjah/bluebird,BridgeAR/bluebird,BridgeAR/bluebird,justsml/bluebird,HBOCodeLabs/bluebird,petkaantonov/bluebird,BridgeAR/bluebird,yonjah/bluebird,HBOCodeLabs/bluebird,yonjah/bluebird,justsml/bluebird,HBOCodeLabs/bluebird,justsml/bluebird