Done

# Conflicts:
#	backend/terminal.ts

frontend/src/pages/Compose.vue

@@ -550,6 +550,10 @@ export default {
                     throw new Error("Services must be an object");
                 }
 
+                if (!config.version) {
+                    config.version = "3.8";
+                }
+
                 this.yamlDoc = doc;
                 this.jsonConfig = config;