Wire: fix write(0) overload

Author: facchinm

libraries/Wire/Wire.h

@@ -56,6 +56,9 @@ class MbedI2C : public HardwareI2C
     virtual void onRequest(void(*)(void));
 
     virtual size_t write(uint8_t data);
+    virtual size_t write(int data) {
+      return write ((uint8_t)data);
+    };
     virtual size_t write(const uint8_t* data, int len);
     using Print::write;
     virtual int read();