Update dependencies

vendor/github.com/akutz/memconn/Makefile

@@ -0,0 +1,31 @@
+SHELL := /bin/bash
+
+all: build
+
+build: memconn.a
+memconn.a: $(filter-out %_test.go, $(wildcard *.go))
+	go build -o $@
+
+GO_VERSION ?= 1.9.4
+IMPORT_PATH := github.com/akutz/memconn
+
+docker-run:
+	docker run --rm -it \
+      -v $$(pwd):/go/src/$(IMPORT_PATH) \
+      golang:$(GO_VERSION) \
+      make -C /go/src/$(IMPORT_PATH) $(MAKE_TARGET)
+
+BENCH ?= .
+
+benchmark:
+	go test -bench $(BENCH) -run Bench -benchmem .
+
+benchmark-go1.9:
+	MAKE_TARGET=benchmark $(MAKE) docker-run
+
+test:
+	go test
+	go test -race -run 'Race$$'
+
+test-go1.9:
+	MAKE_TARGET=test $(MAKE) docker-run