Update readme

Author: libxzr

README.md

@@ -1,9 +1,13 @@
 # Horizon Kernel Flasher
 
-### What is this?
+## What is this?
 
 - A simple app that can flash [AnyKernel](https://github.com/osm0sis/AnyKernel3) flashable zips on android
 
-### Screenshots
+## Screenshots
 
-<img src="https://raw.githubusercontent.com/xzr467706992/HorizonKernelFlasher/master/screenshots/ss1.jpg" width="180" height="400" /> <img src="https://raw.githubusercontent.com/xzr467706992/HorizonKernelFlasher/master/screenshots/ss2.jpg" width="180" height="400" /> 
+<img src="screenshots/ss1.jpg" width="180" height="400" /> <img src="screenshots/ss2.jpg" width="180" height="400" />
+
+## Prebuilt binary
+
+- [mkbootfs](https://github.com/libxzr/mkbootfs)