[readme] update readme

Signed-off-by: danbugs <danilochiarlone@gmail.com>

Author: danbugs

README.md

@@ -10,12 +10,12 @@ The book is still under development, so this repository will be updated as I pro
     - [x] Chapter 1 (Introduction to Wasm on the Server)
     - [x] Chapter 2 (Building Server-Side Applications with Wasm Modules)
     - [x] Chapter 3 (Enhancing Portability and Security with Wasm Components)
+- Part 2: WebAssembly for developers
     - [x] Chapter 4 (Interfacing Wasm with the Underlying System)
     - [x] Chapter 5 (Applications of Wasm from machine learning to databases)
-- Part 2: WebAssembly for developers
     - [x] Chapter 6 (Creating Production-Grade Wasm Applications)
 - Part 3: Wasm on the Cloud and the Edge
     - [x] Chapter 7 (Distributing and deploying Wasm)
-    - [ ] Chapter 8 (Scalability for Wasm with Kubernetes)
+    - [x] Chapter 8 (Scalability for Wasm with Kubernetes)
     - [ ] Chapter 9 (Wasm for Edge Devices and IoT)