makefile: add a go test target
makefile: add a go test target

Myself5/mirrorbits,Myself5/mirrorbits,wsnipex/mirrorbits,kib/mirrorbits,etix/mirrorbits,wsnipex/mirrorbits,etix/mirrorbits,wsnipex/mirrorbits,kib/mirrorbits,etix/mirrorbits,Myself5/mirrorbits,kib/mirrorbits