fixed readme

README.md

@@ -12,35 +12,32 @@ The Virtual Com port via EDBG is used for the com port. You can change this at e
 
 ### USART
 
-RX: PB24
-TX: PB25
+- RX: PB24
+- TX: PB25
 
 Baud Rate: 115200
 
 ### I2C
 
-SDA: PA22
-SCL: PA23
+- SDA: PA22
+- SCL: PA23
 
 Clock frequency: 400khz
 
-
 ## SAMD21 XPLAINED PRO
 
-
 The Virtual Com port via EDBG is used for the com port. You can change this at d21/asf3/d21_i2c_detect/src/config/conf_board.h.
 
 ### USART
 
-RX: PA23
-TX: PA22
+- RX: PA23
+- TX: PA22
 
 Baud Rate: 115200
 
 ### I2C
 
-SCL: PA09
-SDA: PA08
-
+- SCL: PA09
+- SDA: PA08
 
 Clock frequency: 400khz