bump deps, fix clippy warnings

src/request.rs

@@ -132,7 +132,7 @@ impl Request {
     /// ```
     #[cfg(feature = "json")]
     pub fn send_json(&mut self, data: SerdeValue) -> Response {
-        if let None = self.header("Content-Type") {
+        if self.header("Content-Type").is_none() {
             self.set("Content-Type", "application/json");
         }
         self.do_call(Payload::JSON(data))

src/response.rs

@@ -718,11 +718,9 @@ mod tests {
     #[test]
     #[cfg(feature = "json")]
     fn parse_simple_json() {
-        let s = format!(
-            "HTTP/1.1 200 OK\r\n\
+        let s = "HTTP/1.1 200 OK\r\n\
              \r\n\
-             {{\"hello\":\"world\"}}"
-        );
+             {\"hello\":\"world\"}";
         let resp = s.parse::<Response>().unwrap();
         let v = resp.into_json().unwrap();
         let compare = "{\"hello\":\"world\"}"

src/stream.rs

@@ -83,6 +83,7 @@ fn read_https(
     }
 }
 
+#[allow(deprecated)]
 fn is_close_notify(e: &std::io::Error) -> bool {
     if e.kind() != std::io::ErrorKind::ConnectionAborted {
         return false;