Update README.md

README.md

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 Herramienta libre para la determinación de pH de soluciones acuosas.
 
 Adaptación del codigo de DFRobot Gravity: Analog pH Sensor / Meter Kit V2, SKU:SEN0161-V2
-    https://wiki.dfrobot.com/Gravity__Analog_pH_Sensor_Meter_Kit_V2_SKU_SEN0161-V2
-    https://github.com/DFRobot/DFRobot_PH
+
+https://wiki.dfrobot.com/Gravity__Analog_pH_Sensor_Meter_Kit_V2_SKU_SEN0161-V2
+https://github.com/DFRobot/DFRobot_PH
 
 Librerias control sensor temperatura: ds18b20
-    https://github.com/PaulStoffregen/OneWire
-    https://github.com/milesburton/Arduino-Temperature-Control-Library
+
+https://github.com/PaulStoffregen/OneWire
+https://github.com/milesburton/Arduino-Temperature-Control-Library
 
 ![foto](/Imagenes/pHimetro2.jpg)