Change to go version 1.8.3
Change to go version 1.8.3

Version 1.8 has issues on MacOS with Xcode 8.3.
dsrbecky/gapid,pmuetschard/gapid,google/agi,google/agi,google/gapid,ben-clayton/gapid,dsrbecky/gapid,google/agi,dsrbecky/gapid,ben-clayton/gapid,Qining/gapid,Qining/gapid,dsrbecky/gapid,baldwinn860/gapid,dsrbecky/gapid,baldwinn860/gapid,baldwinn860/gapid,pmuetschard/gapid,Qining/gapid,baldwinn860/gapid,ek9852/gapid,dsrbecky/gapid,google/gapid,ben-clayton/gapid,baldwinn860/gapid,google/agi,google/agi,dsrbecky/gapid,ben-clayton/gapid,baldwinn860/gapid,Qining/gapid,google/gapid,ek9852/gapid,ben-clayton/gapid,google/gapid,pmuetschard/gapid,google/gapid,pmuetschard/gapid,ek9852/gapid,baldwinn860/gapid,pmuetschard/gapid,baldwinn860/gapid,ek9852/gapid,google/agi,pmuetschard/gapid,Qining/gapid,google/gapid,ek9852/gapid,dsrbecky/gapid,Qining/gapid,pmuetschard/gapid,ek9852/gapid,Qining/gapid,google/agi,ben-clayton/gapid,Qining/gapid,google/gapid,ben-clayton/gapid,google/agi,ben-clayton/gapid,google/gapid,ek9852/gapid,pmuetschard/gapid,ek9852/gapid