adds bleeding-edge features to master readme (KalicoCrew#73)

README.md

@@ -42,6 +42,20 @@ Features merged into the master branch:
 
 - [virtual_sdcard: scanning of subdirectories](https://github.com/DangerKlippers/danger-klipper/pull/68) ([klipper#6327](https://github.com/Klipper3d/klipper/pull/6327))
 
+If you're feeling adventurous, take a peek at the extra features in the bleeding-edge branch:
+
+- [dmbutyugin's advanced-features branch](https://github.com/DangerKlippers/danger-klipper/pull/69) [dmbutyugin/advanced-features](https://github.com/dmbutyugin/klipper/commits/advanced-features)
+
+  - [stepper: high precision stepping protocol](https://github.com/DangerKlippers/danger-klipper/pull/69)
+
+  - [extruder: sync extruder motion with input shaper](https://github.com/DangerKlippers/danger-klipper/pull/69)
+
+  - [extruder: new print_pa_tower utility](https://github.com/DangerKlippers/danger-klipper/pull/69)
+
+  - [input_shaper: smooth input shapers](https://github.com/DangerKlippers/danger-klipper/pull/69)
+
+  - [input_shaper: new print_ringing_tower utility](https://github.com/DangerKlippers/danger-klipper/pull/69)
+
 "Dangerous Klipper for dangerous users"
 
 Klipper is a 3d-Printer firmware. It combines the power of a general