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

commit ce17788c4e00ada0cda61947c4aadd8378d3fc9e
parent c4b7a75b69131b86b505f830aa7505097936f070
Author: Florian Dold <florian.dold@gmail.com>
Date:   Thu,  8 Oct 2020 21:15:16 +0530

update submodule doc/prebuilt

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