Add db command to docker-compose example in readme

Signed-off-by: Richard Steinmetz <steinmetz.richard@googlemail.com>

README.md

@@ -152,6 +152,7 @@ volumes:
 services:
   db:
     image: mariadb
+    command: --transaction-isolation=READ-COMMITTED --binlog-format=ROW
     restart: always
     volumes:
       - db:/var/lib/mysql
@@ -192,6 +193,7 @@ volumes:
 services:
   db:
     image: mariadb
+    command: --transaction-isolation=READ-COMMITTED --binlog-format=ROW
     restart: always
     volumes:
       - db:/var/lib/mysql