Update LIBSUSED.md

add arduinoWebSockets

Author: MiG-41

LIBSUSED.md

@@ -9,3 +9,4 @@
 |arduinojson by benoit blanchon | 6.17.2 | https://github.com/bblanchon/ArduinoJson/releases/tag/v6.17.2 |
 |dallastemperature | 3.9.0 | https://github.com/milesburton/Arduino-Temperature-Control-Library/releases/tag/3.9.0 |
 |onewire | 2.3.5 | https://www.pjrc.com/teensy/td_libs_OneWire.html|
+|arduinoWebSockets | 2.3.6 | https://github.com/Links2004/arduinoWebSockets|