[#286] client: Delete useless raw client init

Since raw client initialization is
postponed until the first `Raw()` function
call, there is no need to init empty(
without options) raw client in constructor.

Signed-off-by: Pavel Karpy <carpawell@nspcc.ru>

pkg/client/client.go

@@ -35,7 +35,6 @@ func New(opts ...Option) (Client, error) {
 	}
 
 	return &clientImpl{
-		raw:  client.New(),
 		opts: clientOptions,
 	}, nil
 }