Update readme with github link

Signed-off-by: Simone Orru <simone.orru@secomind.com>

README.md

@@ -12,8 +12,9 @@ Astarte ESP32 SDK lets you connect your ESP32 device to
 The SDK simplifies all the low-level operations like credentials generation, pairing and so on, and
 exposes a high-level API to publish data from your device.
 
-Have a look at the [examples](examples/README.md) for a usage example showing how to send and
-receive data.
+Have a look at the
+[examples](https://github.com/astarte-platform/astarte-device-sdk-esp32/tree/master/examples/README.md)
+for a usage example showing how to send and receive data.
 
 ## Documentation