bump version

README.md

@@ -3,17 +3,18 @@
 ## Example
 ```rust
 use voicevox_client::Client;
+use reqwest::Result;
 use std::{io::Write, fs::File};
 
 #[tokio::main]
-async fn main() {
+async fn main() -> Result<()> {
     let client = Client::new("http://localhost:50021".to_string());
     let audio_query = client
         .create_audio_query("こんにちは", 1, None)
-        .await
-        .unwrap();
-    let audio = audio_query.synthesis(1).await.unwrap();
+        .await?;
+    let audio = audio_query.synthesis(1).await?;
     let mut file = File::create("examples/hello.wav").unwrap();
     file.write_all(&audio).unwrap();
+    Ok(())
 }
 ```