add master/dev clarification in compose file

compose.yml

@@ -1,7 +1,7 @@
 version: "3"
 services:
   gothub:
-    image: codeberg.org/gothub/gothub:latest
+    image: codeberg.org/gothub/gothub:latest   # Master branch
     # image: codeberg.org/gothub/gothub:dev    # Dev branch
     restart: unless-stopped
     ports: