fix(build): remove unused target. (#1183)

Makefile

@@ -2,7 +2,7 @@ GOFMT ?= gofmt "-s"
 PACKAGES ?= $(shell go list ./... | grep -v /vendor/)
 GOFILES := $(shell find . -name "*.go" -type f -not -path "./vendor/*")
 
-all: build
+all: install
 
 install: deps
 	govendor sync