Update library.properties and README.md

Signed-off-by: Frederic.Pillon <[email protected]>

Author: fpistm

README.md

@@ -21,7 +21,11 @@ _RTC hours mode (12 or 24)_
 * **`void begin(RTC_Hour_Format format)`**
 
 _RTC clock source_
-* **`void setClockSource(RTC_Source_Clock source)`** : this function must be called before `begin()`
+* **`void setClockSource(RTC_Source_Clock source)`** : this function must be called before `begin()`.
+
+_RTC Asynchronous and Synchronous prescaler_
+* **`void getPrediv(int8_t *predivA, int16_t *predivS)`** : get user (a)synchronous prescaler values if set else computed ones for the current clock source.
+* **`void setPrediv(int8_t predivA, int16_t predivS)`** : set user (a)synchronous prescaler values.  This function must be called before `begin()`. Use -1 to reset value and use computed ones.
 
 _SubSeconds management_
 * **`uint32_t getSubSeconds(void)`**

library.properties

@@ -1,8 +1,8 @@
 name=STM32duino RTC
 version=1.0.0
-author=Wi6Labs
+author=STMicroelectronics, Wi6Labs
 maintainer=stm32duino
-sentence=Allows to use the RTC functionalities. For STM32 boards.
+sentence=Allows to use the RTC functionalities of STM32 based boards.
 paragraph=With this library you can use the RTC peripheral in order to program actions related to date and time.
 category=Timing
 url=https://github.com/stm32duino/STM32RTC.git