* windows adjust docker cmd for update composer script

bash/update-composer.sh

@@ -1,4 +1,8 @@
 #!/bin/bash
+. ./_docker-cmd.sh || {
+  echo "no docker cmd is presented" && exit 1
+}
+
 PHP_VERSION=$1 # Without dot
 COMPOSER_VERSION=$2
 
@@ -15,4 +19,4 @@ if [[ -z "${COMPOSER_VERSION}" ]]; then
   COMPOSER_VERSION=1
 fi
 
-docker exec -ti "${CONTAINER}" composer self-update --${COMPOSER_VERSION}
+$DOCKER_CMD exec -ti "${CONTAINER}" composer self-update --${COMPOSER_VERSION}