fix - epgsql not starts like app

src/epgsql_pool.app.src

@@ -5,7 +5,7 @@
   {description, "Connection pool for PostgreSQL"},
   {vsn, "1.3.0"},
   {registered, []},
-  {applications, [epgsql, pooler]},
+  {applications, [pooler]},
   {env, [
          {connection_timeout, 10000},
          {query_timeout, 10000},