v1.3.1 to fix compiler error

### Releases v1.3.1

1. Fix compile error to some SAMD21-based boards, such as ADAFRUIT_FEATHER_M0, ARDUINO_SAMD_FEATHER_M0, ADAFRUIT_METRO_M0_EXPRESS, ARDUINO_SAMD_HALLOWING_M0 and ADAFRUIT_BLM_BADGE. Check [Doesn't compile with Adafruit Feather M0 #2](#2).

Author: khoih-prog

README.md

@@ -150,7 +150,7 @@ The catch is **your function is now part of an ISR (Interrupt Service Routine),
 
 ### Releases v1.3.1
 
-1. Fix compile error to some SAMD21-based boards, such as ADAFRUIT_FEATHER_M0, ARDUINO_SAMD_FEATHER_M0, ADAFRUIT_METRO_M0_EXPRESS, ARDUINO_SAMD_HALLOWING_M0 and ADAFRUIT_BLM_BADGE
+1. Fix compile error to some SAMD21-based boards, such as ADAFRUIT_FEATHER_M0, ARDUINO_SAMD_FEATHER_M0, ADAFRUIT_METRO_M0_EXPRESS, ARDUINO_SAMD_HALLOWING_M0 and ADAFRUIT_BLM_BADGE. Check [Doesn't compile with Adafruit Feather M0 #2](https://github.com/khoih-prog/SAMD_TimerInterrupt/issues/2).
 
 
 ### Releases v1.3.0
@@ -1225,7 +1225,7 @@ Sometimes, the library will only work if you update the board core to the latest
 
 ### Releases v1.3.1
 
-1. Fix compile error to some SAMD21-based boards, such as ADAFRUIT_FEATHER_M0, ARDUINO_SAMD_FEATHER_M0, ADAFRUIT_METRO_M0_EXPRESS, ARDUINO_SAMD_HALLOWING_M0 and ADAFRUIT_BLM_BADGE
+1. Fix compile error to some SAMD21-based boards, such as ADAFRUIT_FEATHER_M0, ARDUINO_SAMD_FEATHER_M0, ADAFRUIT_METRO_M0_EXPRESS, ARDUINO_SAMD_HALLOWING_M0 and ADAFRUIT_BLM_BADGE. Check [Doesn't compile with Adafruit Feather M0 #2](https://github.com/khoih-prog/SAMD_TimerInterrupt/issues/2).
 
 ### Releases v1.3.0