Update README.md

Author: MakerM0

README.md

@@ -38,7 +38,7 @@ CircuitPython is used by default. You can also use MicroPython, Arduino.
 2. After rebooting, Then copy the firmware_0826.uf2 file to a USB stick
 3. After rebooting, copy the contents of the softerware folder to the displayed USB stick
 
-Settings.toml modify your wifi information, know the weather key (need to go to the official website to apply) and city
+**Settings.toml** : modify your wifi information, know the weather key (need to go to the official website to apply) and city
 
 The main button is used to access the function options