update

Author: Watson1978

README.md

@@ -89,7 +89,7 @@ This requires to send data via HTTP/HTTPS.
 | parameter                       | type    | description                                                    | default                 |
 |---------------------------------|---------|----------------------------------------------------------------|-------------------------|
 | endpoint                        | string  | The endpoint for HTTP/HTTPS request                            | `http://127.0.0.1:4318` |
-| proxy                           | string  | The proxy for HTTP/HTTPS request                               | optional                |
+| proxy                           | string  | The proxy for HTTP/HTTPS request                               | `nil`                   |
 | error_response_as_unrecoverable | bool    | Raise UnrecoverableError when the response code is not SUCCESS | `true`                  |
 | retryable_response_codes        | array   | The list of retryable response codes                           | `nil`                   |
 | read_timeout                    | integer | The read timeout in seconds                                    | `60`                    |