bump doc/prebuilt submodule - exchange - Base system with REST service to issue digital coins, run by the payment service provider

commit bd8b48393c3161a8d3e4cde26f3c8e372c7d394a
parent c944a5703aecc36e044f3fcd17f6fed41a3e436d
Author: Florian Dold <florian.dold@gmail.com>
Date:   Sat,  5 Oct 2019 22:34:18 +0530

bump doc/prebuilt submodule

	exchange Base system with REST service to issue digital coins, run by the payment service provider
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