Merge pull request #8 from Delph/patch-1

Compilation fix when compiling with DEBUG_SERIAL and DEBUG_EXPANSION_PRINT_ADDRESS

Author: maidnl

src/OptaBlueModule.cpp

@@ -273,7 +273,7 @@ void Module::update() {
   if (millis() - start > 1000) {
     start = millis();
     Serial.print("ADDRESS 0x");
-    Serial.println(address, HEX);
+    Serial.println(wire_i2c_address, HEX);
   }
 #endif
 }