Fixes #336 Do not recognise generator_stop future Stops reporting an error for generator_stop on Python 3.5
Fixes #336 Do not recognise generator_stop future
Stops reporting an error for generator_stop on Python 3.5

xNUTs/PTVS,dut3062796s/PTVS,dut3062796s/PTVS,alanch-ms/PTVS,Microsoft/PTVS,denfromufa/PTVS,DinoV/PTVS,gomiero/PTVS,huguesv/PTVS,zooba/PTVS,gomiero/PTVS,juanyaw/PTVS,mlorbetske/PTVS,ChinaQuants/PTVS,dut3062796s/PTVS,zooba/PTVS,int19h/PTVS,fjxhkj/PTVS,jkorell/PTVS,DEVSENSE/PTVS,jkorell/PTVS,zooba/PTVS,crwilcox/PTVS,gomiero/PTVS,msunardi/PTVS,jkorell/PTVS,xNUTs/PTVS,msunardi/PTVS,mlorbetske/PTVS,alanch-ms/PTVS,juanyaw/PTVS,denfromufa/PTVS,Microsoft/PTVS,modulexcite/PTVS,MetSystem/PTVS,mlorbetske/PTVS,mlorbetske/PTVS,denfromufa/PTVS,MetSystem/PTVS,alanch-ms/PTVS,fjxhkj/PTVS,modulexcite/PTVS,christer155/PTVS,mlorbetske/PTVS,DinoV/PTVS,denfromufa/PTVS,zooba/PTVS,juanyaw/PTVS,crwilcox/PTVS,alanch-ms/PTVS,huguesv/PTVS,xNUTs/PTVS,DEVSENSE/PTVS,fivejjs/PTVS,fivejjs/PTVS,bolabola/PTVS,DinoV/PTVS,DinoV/PTVS,bolabola/PTVS,ChinaQuants/PTVS,DinoV/PTVS,msunardi/PTVS,huguesv/PTVS,dut3062796s/PTVS,bolabola/PTVS,modulexcite/PTVS,denfromufa/PTVS,int19h/PTVS,mlorbetske/PTVS,fjxhkj/PTVS,MetSystem/PTVS,Habatchii/PTVS,MetSystem/PTVS,Habatchii/PTVS,ChinaQuants/PTVS,christer155/PTVS,xNUTs/PTVS,DEVSENSE/PTVS,modulexcite/PTVS,zooba/PTVS,msunardi/PTVS,christer155/PTVS,fjxhkj/PTVS,msunardi/PTVS,alanch-ms/PTVS,int19h/PTVS,DEVSENSE/PTVS,fivejjs/PTVS,juanyaw/PTVS,bolabola/PTVS,Microsoft/PTVS,dut3062796s/PTVS,crwilcox/PTVS,DinoV/PTVS,christer155/PTVS,MetSystem/PTVS,DEVSENSE/PTVS,MetSystem/PTVS,ChinaQuants/PTVS,huguesv/PTVS,ChinaQuants/PTVS,Microsoft/PTVS,xNUTs/PTVS,Microsoft/PTVS,jkorell/PTVS,Habatchii/PTVS,juanyaw/PTVS,gomiero/PTVS,crwilcox/PTVS,huguesv/PTVS,jkorell/PTVS,christer155/PTVS,int19h/PTVS,int19h/PTVS,DEVSENSE/PTVS,bolabola/PTVS,fjxhkj/PTVS,zooba/PTVS,modulexcite/PTVS,msunardi/PTVS,fivejjs/PTVS,int19h/PTVS,xNUTs/PTVS,huguesv/PTVS,fjxhkj/PTVS,crwilcox/PTVS,juanyaw/PTVS,Habatchii/PTVS,alanch-ms/PTVS,crwilcox/PTVS,Habatchii/PTVS,denfromufa/PTVS,jkorell/PTVS,christer155/PTVS,gomiero/PTVS,gomiero/PTVS,ChinaQuants/PTVS,modulexcite/PTVS,dut3062796s/PTVS,bolabola/PTVS,fivejjs/PTVS,fivejjs/PTVS,Microsoft/PTVS,Habatchii/PTVS