Remove version from docker-compose.yaml

https://docs.docker.com/reference/compose-file/version-and-name/#version-top-level-element-obsolete

docker-compose.yaml

@@ -1,5 +1,4 @@
-version: '3.3'
-
+---
 services:
   app:
     build:
@@ -9,7 +8,7 @@ services:
     restart: unless-stopped
 
     volumes:
-    # sqlite database:
+      # sqlite database:
       - ./data:/usr/src/app/data
 
     ports: