Update uart submodule

README.md

@@ -42,9 +42,9 @@ The I2C module is basically identical to SPI, just with a different protocol.
     - [x] Interface for mapping io-pins onto virtual io-ports, where the pins do not have to be located on the same hardware port
     - [x] Provide an example showcasing the usage and possibilities
 - ADC
-    - [ ] Support all hardware provided configuration options
+    - [x] Support common usage with easy extendability
-    - [ ] Compile-time check for correct hardware configuration
+    - [x] Compile-time check for correct hardware configuration
-    - [ ] Provide an example showcasing the usage and possibilities
+    - [x] Provide an example showcasing the usage and possibilities
 - UART
     - [x] Separation of interface and backend-driver
     - [x] Support common usage with easy extendability
@@ -64,4 +64,4 @@ The I2C module is basically identical to SPI, just with a different protocol.
     - [x] Compile-time check for correct hardware configuration
     - [x] Provide an example showcasing the usage and possibilities
 - General
-    - [ ] Support for most common AVR chips (ATmega8, ATmega328, ATtiny85, ...)
+    - [x] Support for most common AVR chips (ATmega8, ATmega328, ATtiny85, ...)