docker-compose.yml: use min version 2.1

faicker · faicker · commit cbe52fac144d · 2020-01-04T14:38:09.000+08:00
Signed-off-by: Faicker Mo &lt;faicker.mo@gmail.com&gt;
diff --git a/docker-compose.yml b/docker-compose.yml
@@ -1,4 +1,4 @@
-version: "2.4"
+version: "2.1"
 x-logging:
   &default-logging
   driver: "json-file"
