Bump libcompose and its dependencies

vendor/github.com/docker/engine-api/Makefile

@@ -0,0 +1,21 @@
+.PHONY: all deps test validate lint
+
+all: deps test validate
+
+deps:
+	go get -t ./...
+	go get github.com/golang/lint/golint
+
+test:
+	go test -race -cover ./...
+
+validate: lint
+	go vet ./...
+	test -z "$(gofmt -s -l . | tee /dev/stderr)"
+
+lint:
+	out="$$(golint ./...)"; \
+	if [ -n "$$(golint ./...)" ]; then \
+		echo "$$out"; \
+		exit 1; \
+	fi