Fix a typo in the README

Author: cparata

README.md

@@ -13,7 +13,7 @@ For SPI it is then required to create a SPI interface before accessing to the se
 An instance can be created and enabled when the SPI bus is used following the procedure below:  
 
     Accelero = new LIS3DHHSensor(dev_spi, CS_PIN);  
-    Accelero->Enable();
+    Accelero->Enable_X();
 
 The access to the sensor values is done as explained below: