Fix wasm panic when trying to change the user-agent

Author: bidoubiwa

src/request.rs

@@ -109,13 +109,11 @@ pub(crate) async fn request<Input: Serialize, Output: DeserializeOwned + 'static
 
     const CONTENT_TYPE: &str = "Content-Type";
     const JSON: &str = "application/json";
-    let user_agent = qualified_version();
 
     // The 2 following unwraps should not be able to fail
     let mut mut_url = url.clone().to_string();
     let headers = Headers::new().unwrap();
     headers.append("Authorization: Bearer", apikey).unwrap();
-    headers.append("User-Agent", &user_agent).unwrap();
 
     let mut request: RequestInit = RequestInit::new();
     request.headers(&headers);