Update README.md, no more makefiles in Go, use go tool.
Update README.md, no more makefiles in Go, use go tool.

louiseGrandjonc/gocode,MerlinDMC/gocode,louiseGrandjonc/gocode,TheBB/gocode,mdempsky/gocode,artnez/gocode,mem/gocode,suncycheng/gocode,fjl/gocode,kerr-huang/Gocode,lmh008/gocode,ghiden/gocode,suncycheng/gocode,suncycheng/gocode,mem/gocode,MerlinDMC/gocode,nsf/gocode,beni55/gocode,MerlinDMC/gocode,artnez/gocode,thousandhigh/gocode,suncycheng/gocode,nsf/gocode,artnez/gocode,thousandhigh/gocode,syohex/gocode,nsf/gocode,artnez/gocode,nsf/gocode,lmh008/gocode,fjl/gocode,syohex/gocode,mem/gocode,syohex/gocode,mdempsky/gocode,kerr-huang/Gocode,thousandhigh/gocode,syohex/gocode,fjl/gocode,toqueteos/LightTable-Go,beni55/gocode,kerr-huang/Gocode,TheBB/gocode,ghiden/gocode,kerr-huang/Gocode,mdempsky/gocode,ghiden/gocode,thousandhigh/gocode,beni55/gocode,louiseGrandjonc/gocode,louiseGrandjonc/gocode,lmh008/gocode,TheBB/gocode,beni55/gocode,toqueteos/LightTable-Go,MerlinDMC/gocode,fjl/gocode,TheBB/gocode,mem/gocode,lmh008/gocode,ghiden/gocode