README minor tweak

README.md

@@ -50,12 +50,12 @@ Hive is deployed as Docker container (see `Dockerfile`).
 | LOG_LEVEL              | INFO    |
 | HTTP_SERVER_PORT       | 8080    |
 | HTTP_SERVER_STATS_PORT | 9191    |
-| DATABASE_URL           | ''      |
+| DATABASE_URL           |         |
 
 ## Services
 Please see `/service`.
 
------
+# Other
 
 ## Documentation
 Generate documentation.