Use another variant of logo for dark background

README.md

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-![logo-ash-horizontal](logo/ash/svg/logo-ash-horizontal.svg)
+![logo-ash-horizontal](logo/ash/svg/logo-ash-horizontal.svg#gh-light-mode-only)
+![logo-ash-horizontal](logo/ash/svg/logo-ash-horizontal-dark-bg.svg#gh-dark-mode-only)
 
 Serialization toolbox for Akka messages, events and persistent state that helps achieve compile-time guarantee on
 serializability. There are some Akka serialization caveats this tool can help with: