Added DEFAULT_EMAIL env variable to docker-compose docs

Author: marc-hg

docs/Docker-Compose.md

@@ -21,6 +21,8 @@ services:
   nginx-proxy:
     image: nginxproxy/nginx-proxy
     container_name: nginx-proxy
+    environment:
+      - DEFAULT_EMAIL=mail@yourdomain.tld
     ports:
       - "80:80"
       - "443:443"
@@ -60,6 +62,8 @@ services:
   nginx-proxy:
     image: nginx:alpine
     container_name: nginx-proxy
+    environment:
+      - DEFAULT_EMAIL=mail@yourdomain.tld
     ports:
       - "80:80"
       - "443:443"