fix build (#45)

README.md

@@ -20,6 +20,21 @@ MicroChip 24LC512, 24LC256, 24LC64, 24LC32, 24LC16, 24LC08, 24LC04, 24LC02, 24LC
 The **I2C_eeprom_cyclic_store** interface is documented [here](README_cyclic_store.md)
 
 
+## Schematic
+
+```cpp
+        +---U---+
+    A0  | 1   8 |  VCC = +5V
+    A1  | 2   7 |   WP = write protect pin
+    A2  | 3   6 |  SCL = I2C clock
+   GND  | 4   5 |  SDA = I2C data
+        +-------+
+
+default address = 0x50 .. 0x57 depending on three address lines
+
+```
+
+
 ## Interface
 
 The interface is kept quite identical to the I2C_24LC1025 library.

examples/I2C_eeprom_updateBlock/I2C_eeprom_updateBlock.ino

@@ -129,7 +129,11 @@ void dump(uint32_t from, uint32_t to)
     {
       char buffer[24];
       Serial.print('\n');
-      sprintf(buffer, "%08lX\t", i);
+#if defined (ESP8266) || defined(ESP32)
+      sprintf(buffer, "%08X\t", i);   //  ESP cast (long unsigned int)
+#else
+      sprintf(buffer, "%08lX\t", i);  //  AVR needs lX
+#endif;
       Serial.print(buffer);
     }
     sprintf(buffer, "%02X\t", ee.readByte(i));