Update CHANGELOG.md to add alarm changelog

Add rtc alarm interrupt handler

Signed-off-by: Huang Rui <vowstar@gmail.com>

CHANGELOG.md

@@ -63,6 +63,7 @@ Kendryte K210 first SDK with FreeRTOS, have fun.
   - Reduce stack size
 
 ## 0.5.2
+
 - Major change
   - Add KPU driver for latest model compiler
   - Automatic set PROJ if user not set it
@@ -77,6 +78,7 @@ Kendryte K210 first SDK with FreeRTOS, have fun.
   - Add new timer interrupt API
 
 ## 0.5.3
+
 - Major change
   - Modify KPU driver for latest model compiler
   - Add freertos
@@ -94,6 +96,7 @@ Kendryte K210 first SDK with FreeRTOS, have fun.
   - Fix core1 interrupt problem
 
 ## 0.5.4
+
 - Major change
   - Modify KPU driver for NNCASE
   - Add APU driver
@@ -109,6 +112,7 @@ Kendryte K210 first SDK with FreeRTOS, have fun.
   - Fix bus reset problem
 
 ## 0.5.5
+
 - Major change
   - Add SPI I2C I2S UART DMA callback
   - Add malloc lock
@@ -128,6 +132,7 @@ Kendryte K210 first SDK with FreeRTOS, have fun.
 
   - Add irda rs485
   - Add rtc tick interrupt handler
+  - Add rtc alarm interrupt handler
   - Modify system default print uart
   - Update KPU driver for lastest NNCASE
   - Delete freertos