v1.2.1 to fix DutyCycle bug, etc.

### Releases v1.2.1

1. Fix `DutyCycle` bug. Check [float precisison of DutyCycle only sometimes working #3](khoih-prog/SAMD_Slow_PWM#3)
2. Fix `New Period` display bug. Check [random dropouts #4](khoih-prog/SAMD_Slow_PWM#4)
3. Display informational warning only when `_PWM_LOGLEVEL_` > 3
4. Add support to `Sparkfun Pro nRF52840 Mini`
5. Update examples
6. Update `Packages' Patches`

src/nRF52_Slow_PWM_ISR.hpp

@@ -35,13 +35,13 @@
 #endif
 
 #ifndef NRF52_SLOW_PWM_VERSION
-  #define NRF52_SLOW_PWM_VERSION           "NRF52_Slow_PWM v1.2.0"
+  #define NRF52_SLOW_PWM_VERSION           "NRF52_Slow_PWM v1.2.1"
 
   #define NRF52_SLOW_PWM_VERSION_MAJOR      1
   #define NRF52_SLOW_PWM_VERSION_MINOR      2
-  #define NRF52_SLOW_PWM_VERSION_PATCH      0
+  #define NRF52_SLOW_PWM_VERSION_PATCH      1
 
-  #define NRF52_SLOW_PWM_VERSION_INT        1002000  
+  #define NRF52_SLOW_PWM_VERSION_INT        1002000 1
 #endif
 
 #ifndef _PWM_LOGLEVEL_