Minor improvement to docker-compose file.

Author: Benjamin Maurer

frameworks/Haskell/postgrest/docker-compose.yml

@@ -1,4 +1,3 @@
-version: '3'
 services:
   tfb-database:
     build: 
@@ -13,4 +12,6 @@ services:
       dockerfile: postgrest.dockerfile
       context: .
     ports:
-      - 3030:3000
+      - 3030:3000
+    depends_on:
+      - tfb-database