Add the 2.2 version back to the main compose file for compatibility.

docker-compose.migrate.yml

@@ -1,9 +1,11 @@
-services:
-  web:
-    volumes:
+version : '2.2'
+
+services :
+  web :
+    volumes :
       - /var/azuracast/stations:/var/azuracast/stations
       - /var/azuracast/backups:/var/azuracast/backups
 
-  stations:
-    volumes:
+  stations :
+    volumes :
       - /var/azuracast/stations:/var/azuracast/stations

docker-compose.sample.yml

@@ -9,6 +9,9 @@
 #   docker-compose.override.yml
 # with any changes you need to make.
 #
+
+version : '2.2'
+
 services :
   nginx_proxy :
     container_name : nginx_proxy