Bump libcompose and its dependencies

vendor/github.com/docker/engine-api/client/version.go

@@ -0,0 +1,21 @@
+package client
+
+import (
+	"encoding/json"
+
+	"github.com/docker/engine-api/types"
+	"golang.org/x/net/context"
+)
+
+// ServerVersion returns information of the docker client and server host.
+func (cli *Client) ServerVersion(ctx context.Context) (types.Version, error) {
+	resp, err := cli.get(ctx, "/version", nil, nil)
+	if err != nil {
+		return types.Version{}, err
+	}
+
+	var server types.Version
+	err = json.NewDecoder(resp.body).Decode(&server)
+	ensureReaderClosed(resp)
+	return server, err
+}