Remove unused super call

Author: josevalim

lib/db_connection/connection_pool.ex

@@ -23,11 +23,6 @@ defmodule DBConnection.ConnectionPool do
     GenServer.start_link(__MODULE__, {mod, opts}, start_opts(opts))
   end
 
-  @doc false
-  def child_spec(opts) do
-    super(opts)
-  end
-
   @doc false
   @impl DBConnection.Pool
   def checkout(pool, callers, opts) do