Fix pool (#4935)

Author: dorner

config/database.yml

@@ -32,7 +32,6 @@ production:
   adapter: postgresql
   encoding: unicode
   host: <%= ENV["DIAPER_DB_HOST"] %>
-  pool: 5
   username: <%= ENV["DIAPER_DB_USERNAME"] %>
   password: <%= ENV["DIAPER_DB_PASSWORD"] %>
   database: <%= ENV["DIAPER_DB_DATABASE"] %>