Update README.md

tjdskaqks · May 9, 2019 · 9a8baaa · 9a8baaa
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 **UART**
 ------------------------------
-	            UART    TX    RX  
+	            UART     TX    RX  
 	BLUETOOTH   USART2   PD5   PD6  
 	PC          USART3   PD8   PD9  
 	CC2530      UART4    PC10  PC11