Fix naming of the chapter dir

11_compose/demo/django/docker-compose.yml

@@ -0,0 +1,15 @@
+
+services:
+
+  db:
+    image: postgres
+    environment:
+      POSTGRES_PASSWORD: 'postgres'
+
+  web:
+    build: .
+    command: python manage.py runserver 0.0.0.0:8000
+    volumes:
+      - .:/code
+    ports:
+      - "8000:8000"