Update README.adoc

cleaned the formatting a little

uart/README.adoc

@@ -6,6 +6,7 @@ Send data from the UART1 port to the UART0 port.
 == Other code to try
 [source.python]
 uart0 = UART(0)     #opens a UART connection at the default baudrate of 115,200
+
 uart0.readline()    #reads until the CR (\r) and NL (\n) characters then returns the line