chore: update readme

Author: ssut

README.md

@@ -2,10 +2,14 @@
 
 An android OTA payload dumper written in Go.
 
+Download prebuilt binaries for macOS and windows via [here](https://github.com/ssut/payload-dumper-go/releases).
+
 ## Features
 
 ![screenshot](https://i.imgur.com/IJtwoWU.png)
 
+See how fast payload-dumper-go is: https://imgur.com/a/X6HKJT4. (MacBook Pro 16-inch 2019 i9-9750H, 16G)
+
 - Incredibly fast decompression. All decompression progresses are executed in parallel.
 - Payload checksum verification.
 - Support original zip package that contains payload.bin.