chore: release 4.0.3

- Bump version and README crates.io examples to 4.0.3.

Made-with: Cursor

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "sol-trade-sdk"
-version = "4.0.2"
+version = "4.0.3"
 edition = "2021"
 authors = [
     "William <byteblock6@gmail.com>",

README.md

@@ -101,14 +101,14 @@ Add the dependency to your `Cargo.toml`:
 
 ```toml
 # Add to your Cargo.toml
-sol-trade-sdk = { path = "./sol-trade-sdk", version = "4.0.2" }
+sol-trade-sdk = { path = "./sol-trade-sdk", version = "4.0.3" }
 ```
 
 ### Use crates.io
 
 ```toml
 # Add to your Cargo.toml
-sol-trade-sdk = "4.0.2"
+sol-trade-sdk = "4.0.3"
 ```
 
 ## 🛠️ Usage Examples

README_CN.md

@@ -101,14 +101,14 @@ git clone https://github.com/0xfnzero/sol-trade-sdk
 
 ```toml
 # 添加到您的 Cargo.toml
-sol-trade-sdk = { path = "./sol-trade-sdk", version = "4.0.2" }
+sol-trade-sdk = { path = "./sol-trade-sdk", version = "4.0.3" }
 ```
 
 ### 使用 crates.io
 
 ```toml
 # 添加到您的 Cargo.toml
-sol-trade-sdk = "4.0.2"
+sol-trade-sdk = "4.0.3"
 ```
 
 ## 🛠️ 使用示例