add chinese support (#265)

* add chinese support

* Update ResponseBodyCallback.java

fix

---------

Co-authored-by: bu.liwen <[email protected]>

Author: Mrblw

service/src/main/java/com/theokanning/openai/service/ResponseBodyCallback.java

@@ -4,6 +4,7 @@
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
+import java.nio.charset.StandardCharsets;
 
 import com.fasterxml.jackson.databind.ObjectMapper;
 import com.theokanning.openai.OpenAiError;
@@ -54,7 +55,7 @@ public void onResponse(Call<ResponseBody> call, Response<ResponseBody> response)
             }
 
             InputStream in = response.body().byteStream();
-            reader = new BufferedReader(new InputStreamReader(in));
+            reader = new BufferedReader(new InputStreamReader(in, StandardCharsets.UTF_8));
             String line;
             SSE sse = null;