Make volume names more unique

compose.yml

@@ -6,7 +6,7 @@ services:
     image: "maxking/mailman-core:0.3"
     hostname: mailman-core
     volumes:
-      - "core:/opt/mailman/"
+      - "mailman-core:/opt/mailman/"
     networks:
       - internal
     secrets:
@@ -40,7 +40,7 @@ services:
     networks:
       - internal
     volumes:
-      - "web:/opt/mailman-web-data"
+      - "mailman-web:/opt/mailman-web-data"
     secrets:
       - db_password
       - django_secret_key
@@ -101,10 +101,9 @@ networks:
     external: true
 
 volumes:
-  core:
   db:
-  mqueue:
-  web:
+  mailman-core:
+  mailman-web:
 
 secrets:
   db_password: