docs(readme): Update CodeGPT binary download links and version number

- Update download links to latest version of CodeGPT binary for various operating systems
- Update version number in example code snippet

Author: appleboy

README.md

@@ -15,32 +15,32 @@ The pre-compiled binaries can be downloaded from [release page](https://github.c
 On linux AMD64
 
 ```sh
-wget -c https://github.com/appleboy/CodeGPT/releases/download/v0.0.2/CodeGPT-0.0.2-linux-amd64 -O codegpt
+wget -c https://github.com/appleboy/CodeGPT/releases/download/v0.0.3/CodeGPT-0.0.3-linux-amd64 -O codegpt
 ```
 
 On macOS (Intel amd64)
 
 ```sh
-wget -c https://github.com/appleboy/CodeGPT/releases/download/v0.0.2/CodeGPT-0.0.2-darwin-amd64 -O codegpt
+wget -c https://github.com/appleboy/CodeGPT/releases/download/v0.0.3/CodeGPT-0.0.3-darwin-amd64 -O codegpt
 ```
 
 On macOS (Apple arm64)
 
 ```sh
-wget -c https://github.com/appleboy/CodeGPT/releases/download/v0.0.2/CodeGPT-0.0.2-darwin-arm64 -O codegpt
+wget -c https://github.com/appleboy/CodeGPT/releases/download/v0.0.3/CodeGPT-0.0.3-darwin-arm64 -O codegpt
 ```
 
 On Windows (AMD64)
 
 ```sh
-wget -c https://github.com/appleboy/CodeGPT/releases/download/v0.0.2/CodeGPT-0.0.2-windows-amd64.exe -O codegpt.exe
+wget -c https://github.com/appleboy/CodeGPT/releases/download/v0.0.3/CodeGPT-0.0.3-windows-amd64.exe -O codegpt.exe
 ```
 
 Change the binary permission to `755` and move to system bin directory. Try the `codegpt` command as below
 
 ```sh
 $ codegpt version
-version: v0.0.2 commit: 500ae35
+version: v0.0.3 commit: 415c8a1
 ```
 
 ## Setup