Remove version declaration in docker compose files.

docker-compose.yml

@@ -1,5 +1,3 @@
-version: "3.5"
-
 # The docker-compose.yml file is not meant to be modified itself. 
 # Instead use the following files for configurations:
 # - .env: Environment variables for the docker-compose.yml file.

docker-compose/docker-compose.development.yml

@@ -1,5 +1,3 @@
-version: "3.5"
-
 services:
   nopaque:
     environment:

docker-compose/docker-compose.scale.yml

@@ -1,5 +1,3 @@
-version: "3.5"
-
 services:
   nopaque:
     environment:

docker-compose/docker-compose.traefik.yml

@@ -1,5 +1,3 @@
-version: "3.5"
-
 networks:
   traefik:
     external: true