Docker Compose: version is obsolete

Docker Compose: persist logs folder
pom.xml: add commons-io as dependency

docker-compose.yml

@@ -1,5 +1,3 @@
-version: '3.3'
-
 services:
   db:
     image: mariadb:lts
@@ -25,6 +23,8 @@ services:
     restart: unless-stopped
     depends_on:
       - db
+    volumes:
+      - ./logs:/app/logs
     environment:
       MYSQL_HOST: 'db'
       MYSQL_USER: 'java'