removed go 1.4 from travis build script
removed go 1.4 from travis build script

mroote/factorio-server-manager,sean-callahan/factorio-server-manager,MajorMJR/factorio-server-manager,mroote/factorio-server-manager,mroote/factorio-server-manager,sean-callahan/factorio-server-manager,MajorMJR/factorio-server-manager,MajorMJR/factorio-server-manager,mroote/factorio-server-manager,MajorMJR/factorio-server-manager,sean-callahan/factorio-server-manager,sean-callahan/factorio-server-manager