README Changes Version 2.2.0

Author: mathertel

README.md

@@ -4,8 +4,6 @@
 
 [![arduino-library-badge](https://www.ardu-badge.com/badge/LiquidCrystal_PCF8574.svg?)](https://www.ardu-badge.com/LiquidCrystal_PCF8574)
 
-[![GitLicense](https://gitlicense.com/badge/mathertel/LiquidCrystal_PCF8574)](https://gitlicense.com/license/mathertel/LiquidCrystal_PCF8574)
-
 A library for driving LiquidCrystal displays (LCD) by using the I2C bus and an PCF8574 I2C adapter.
 
 There are modules that can be soldered or stacked to the display that offers an I2C interface for communication instead of the 8+ digital lines that are used to send data to the display.
@@ -15,6 +13,26 @@ If you use a module with a different wiring, you can use one of the class constr
 
 See the web site for more details and pictures: <https://www.mathertel.de/Arduino/LiquidCrystal_PCF8574.aspx>
 
+## Changes Version 2.2.0 (2023-04-03)
+
+The default i2c address 0x27 is set as default parameter.
+
+You can use an explicit i2c address with
+
+``` cpp
+LiquidCrystal_PCF8574 lcd(0x22);  // set the LCD address to 0x27 
+```
+
+or you can rely on the default i2c address = 0x27 with
+
+``` cpp
+LiquidCrystal_PCF8574 lcd();  // use the default LCD address == 0x27 
+```
+
+See datasheet of PCF8574 (and PCF8574A) for further info on usable i2c addresses.
+
+Thanks for contribution from @robaol
+
 ## Changes Version 2.1.0 (2022-08-21)
 
 Enables using a non-default i2c / TwoWire port for boards that support multiple ports.
@@ -23,7 +41,6 @@ Added example `LCD_Burnin.ino` showing how to transfer a 20 char and 4 lines buf
 
 Thanks for additions from @uutzinger
 
-
 ## Changes Version 2.0.0 (2022-05-26)
 
 * The interface was modified to use 8-bit datatypes as supported by the underling hardware.