Update README.md

Update README for Teensy 4.0 support
OpenHumidistat · Aug 23, 2024 · 8ddee74 · 8ddee74
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diff --git a/README.md b/README.md
@@ -6,10 +6,11 @@
 This repository contains the Arduino firmware that implements a humidistat (humidity controller) by actuating two
 solenoid valves. The firmware can be used on a variety of 
 [Arduino-compatible boards](https://docs.platformio.org/en/latest/frameworks/arduino.html#boards), but is developed for
- and tested on the following two MCU boards:
+ and tested on the following MCU boards:
 
 - Arduino Uno (AVR ATmega328P)
 - Teensy LC (ARM Cortex-M0+)
+- Teensy 4.0 (ARM Cortex-M7)
 
 ![](docs/pic.jpg)