message: fix(http1): fix title-case option when header names have symbols
  Don't eat the first character in a header name if it's not a letter. Same thing after a `-`
diff: @@ -943,6 +943,8 @@ fn title_case(dst: &mut Vec<u8>, name: &[u8]) {
  if let Some(c) = iter.next() {
  if *c >= b'a' && *c <= b'z' {
  dst.push(*c ^ b' ');
  + } else {
  + dst.push(*c);
  }
  }
  @@ -953,6 +955,8 @@ fn title_case(dst: &mut Vec<u8>, name: &[u8]) {
  if let Some(c) = iter.next() {
  if *c >= b'a' && *c <= b'z' {
  dst.push(*c ^ b' ');
  + } else {
  + dst.push(*c);
  }
  }
  }
  @@ -1371,6 +1375,7 @@ mod tests {
  let mut head = MessageHead::default();
  head.headers.insert("content-length", HeaderValue::from_static("10"));
  head.headers.insert("content-type", HeaderValue::from_static("application/json"));
  + head.headers.insert("*-*", HeaderValue::from_static("o_o"));
  let mut vec = Vec::new();
  Client::encode(Encode {
  @@ -1381,7 +1386,7 @@ mod tests {
  title_case_headers: true,
  }, &mut vec).unwrap();
  - assert_eq!(vec, b"GET / HTTP/1.1\r\nContent-Length: 10\r\nContent-Type: application/json\r\n\r\n".to_vec());
  + assert_eq!(vec, b"GET / HTTP/1.1\r\nContent-Length: 10\r\nContent-Type: application/json\r\n*-*: o_o\r\n\r\n".to_vec());
  }
  #[test]
  