update document to enable ws & rustls / openssl if user wants to use websockets (#1197)
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@ -29,7 +29,7 @@ println!("Got code: {}", serde_json::to_string(&code)?);
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# Websockets
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The crate has support for WebSockets via Tokio.
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The crate has support for WebSockets via Tokio. Please ensure that you have the "ws" and "rustls" / "openssl" features enabled if you wish to use WebSockets.
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```
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# async fn foo() -> Result<(), Box<dyn std::error::Error>> {
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