[readme] Words about retain

hsaturn · Mar 22, 2023 · f8a2e35 · f8a2e35
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@@ -24,6 +24,7 @@ TinyMqtt is a small, fast and capable Mqtt Broker and Client for Esp8266 / Esp32
 
 ## Features
 
+- Supports retained messages (not activated by default)
 - Async Wifi compatible (me-no-dev/ESPAsyncTCP@^1.2.2)
 - Very fast broker I saw it re-sent 1000 topics per second for two
   clients that had subscribed (payload ~15 bytes ESP8266). No topic lost.