Update es6 shim
Update es6 shim

SourcePointUSA/when,ning-github/when,DJDNS/when.js,caporta/when,frank-weindel/when,anthonyvia/when,stevage/when,ning-github/when,petkaantonov/when,stevage/when,frank-weindel/when,tkirda/when,mlennon3/when,anthonyvia/when,SourcePointUSA/when,tkirda/when,caporta/when,mlennon3/when