Merge pull request #349 from felias-fogg/master

bump version number to 3.1.1

Author: MCUdude

avr/platform.txt

@@ -5,7 +5,7 @@
 # https://arduino.github.io/arduino-cli/latest/platform-specification/
 
 name=MiniCore
-version=3.1.0
+version=3.1.1
 
 # AVR compile variables
 # ---------------------