Revert "Remove version from compose files to conform to the specification (#167)"

This reverts commit 2056ab2f01.

angular/README.md

@@ -14,6 +14,7 @@ Project structure:
 
 [_docker-compose.yaml_](docker-compose.yaml)
 ```
+version: "3.7"
 services:
   web:
     build: angular

angular/docker-compose.yaml

@@ -1,3 +1,4 @@
+version: "3.7"
 services:
   web:
     build: angular

apache-php/docker-compose.yaml

@@ -1,3 +1,4 @@
+version: "3.7"
 services:
   web:
     build: app

aspnet-mssql/docker-compose.yaml

@@ -1,3 +1,4 @@
+version: "3.7"
 services:
   web:
     build: app/aspnetapp

django/docker-compose.yml

@@ -1,4 +1,5 @@
-services:
+version: '3.7' 
+services: 
   web: 
     build: app 
     ports: 

elasticsearch-logstash-kibana/docker-compose.yml

@@ -1,3 +1,5 @@
+version: '3.8'
+
 services:
   elasticsearch:
     image: elasticsearch:7.14.2

flask/docker-compose.yaml

@@ -1,4 +1,5 @@
-services:
+version: '3' 
+services: 
   web: 
     build: app 
     ports: 

gitea-postgres/docker-compose.yaml

@@ -1,3 +1,4 @@
+version: '3.7'
 services:
   gitea:
     image: gitea/gitea:latest

minecraft/docker-compose.yml

@@ -1,3 +1,4 @@
+version: '3.7'
 services:
  minecraft:
    image: itzg/minecraft-server

nextcloud-postgres/docker-compose.yaml

@@ -1,3 +1,4 @@
+version: '3.7'
 services:
   nc:
     image: nextcloud:apache

nextcloud-redis-mariadb/docker-compose.yaml

@@ -1,3 +1,4 @@
+version: '3.7'
 services:
   nc:
     image: nextcloud:apache

nginx-aspnet-mysql/docker-compose.yaml

@@ -1,3 +1,4 @@
+version: "3.7"
 services:
   backend:
     build: backend

nginx-flask-mongo/docker-compose.yaml

@@ -1,3 +1,4 @@
+version: "3.7"
 services:
   web:
     image: nginx

nginx-flask-mysql/docker-compose.yaml

@@ -1,3 +1,4 @@
+version: "3.7"
 services:
   db:
     # We use a mariadb image which supports both amd64 & arm64 architecture

nginx-golang-mysql/docker-compose.yaml

@@ -1,3 +1,4 @@
+version: "3.7"
 services:
   backend:
     build: backend

nginx-golang-postgres/docker-compose.yaml

@@ -1,3 +1,4 @@
+version: "3.7"
 services:
   backend:
     build: backend

nginx-golang/README.md

@@ -16,6 +16,7 @@ Project structure:
 
 [_docker-compose.yaml_](docker-compose.yaml)
 ```
+version: "3.7"
 services:
   frontend:
     build: frontend

nginx-golang/docker-compose.yml

@@ -1,3 +1,4 @@
+version: "3.7"
 services:
   frontend:
     build: frontend

nginx-wsgi-flask/docker-compose.yaml

@@ -1,3 +1,4 @@
+version: "3.7"
 services:
   nginx-proxy:
     build: nginx

prometheus-grafana/README.md

@@ -14,6 +14,7 @@ Project structure:
 
 [_docker-compose.yml_](docker-compose.yml)
 ```
+version: "3.7"
 services:
   prometheus:
     image: prom/prometheus

prometheus-grafana/docker-compose.yml

@@ -1,3 +1,4 @@
+version: "3.7"
 services:
   prometheus:
     image: prom/prometheus

react-express-mongodb/docker-compose.yml

@@ -1,3 +1,4 @@
+version: "3.7"
 services:
   frontend:
     build: frontend

react-express-mysql/docker-compose.yaml

@@ -1,3 +1,4 @@
+version: "3.7"
 services:
   backend:
     build:

react-java-mysql/docker-compose.yaml

@@ -1,3 +1,4 @@
+version: "3.7"
 services:
   backend:
     build: backend

react-rust-postgres/docker-compose.yaml

@@ -1,3 +1,4 @@
+version: "3.7"
 services:
   frontend:
     build:

sparkjava-mysql/README.md

@@ -16,6 +16,7 @@ Project structure:
 
 [_docker-compose.yaml_](docker-compose.yaml)
 ```
+version: "3.7"
 services:
   backend:
     build: backend

sparkjava-mysql/docker-compose.yaml

@@ -1,3 +1,4 @@
+version: "3.7"
 services:
   backend:
     build: backend

sparkjava/README.md

@@ -13,6 +13,7 @@ Project structure:
 
 [_docker-compose.yaml_](docker-compose.yaml)
 ```
+version: "3.7"
 services:
   sparkjava:
     build: sparkjava

sparkjava/docker-compose.yaml

@@ -1,3 +1,4 @@
+version: "3.7"
 services:
   sparkjava:
     build: sparkjava

spring-postgres/README.md

@@ -16,6 +16,7 @@ Project structure:
 
 [_docker-compose.yaml_](docker-compose.yaml)
 ```
+version: "3.7"
 services:
   backend:
     build: backend

spring-postgres/docker-compose.yaml

@@ -1,3 +1,4 @@
+version: "3.7"
 services:
   backend:
     build: backend

traefik-golang/README.md

@@ -13,6 +13,7 @@ Project structure:
 
 [_docker-compose.yaml_](docker-compose.yaml)
 ```
+version: "3.7"
 services:
   frontend:
     image: traefik:2.2

traefik-golang/docker-compose.yml

@@ -1,3 +1,4 @@
+version: "3.7"
 services:
   frontend:
     image: traefik:2.2

vuejs/README.md

@@ -13,6 +13,7 @@ Project structure:
 
 [_docker-compose.yaml_](docker-compose.yaml)
 ```
+version: "3.7"
 services:
   web:
     build: vuejs

vuejs/docker-compose.yaml

@@ -1,3 +1,4 @@
+version: "3.7"
 services:
   web:
     build: vuejs

wordpress-mysql/docker-compose.yaml

@@ -1,3 +1,4 @@
+version: '3.7'
 services:
   db:
     # We use a mariadb image which supports both amd64 & arm64 architecture