fix gox

Author: cnbattle

Makefile

@@ -80,7 +80,7 @@ release-dirs:
 
 release-build:
 	@which gox > /dev/null; if [ $$? -ne 0 ]; then \
-		$(GO) get -u github.com/mitchellh/gox; \
+		$(GO) install github.com/mitchellh/gox@latest; \
 	fi
 	gox -os="$(TARGETS)" -arch="$(ARCHS)" -tags="$(TAGS)" -ldflags="-s -w $(LDFLAGS)" -output="$(DIST)/binaries/$(EXECUTABLE)-$(VERSION)-{{.OS}}-{{.Arch}}"