Added Symbol.toStringTag support to Promise (#1421)
Added Symbol.toStringTag support to Promise (#1421)

* Added Symbol.toStringTag support to Promise

* Returned Object for Symbol.toStringTag

petkaantonov/bluebird,petkaantonov/bluebird,HBOCodeLabs/bluebird,HBOCodeLabs/bluebird,petkaantonov/bluebird,HBOCodeLabs/bluebird