Update repositories.txt with mqtt5nano (arduino#2528)

awootton · web-flow · commit 1ee1a414d1db · 2023-03-02T08:06:47.000Z
Mqtt5 and http utilities to create things for the knotfree.net app.
diff --git a/repositories.txt b/repositories.txt
@@ -5617,3 +5617,4 @@ https://github.com/Augmented-Robotics/roboheart-arduino-library
 https://github.com/tanakamasayuki/EspEasyUtils
 https://github.com/arduino-libraries/Arduino_AdvancedAnalog
 https://github.com/virtual-maker/MaterialBoard
+https://github.com/awootton/mqtt5nano
