Rustfmt pass, and rustfmt --check in CI"

Signed-off-by: Maxime “pep” Buquet <pep@bouah.net>

xmpp-parsers/src/jingle_ibb.rs

@@ -26,8 +26,8 @@ mod tests {
     use super::*;
     use crate::util::error::Error;
     use crate::Element;
-    use std::error::Error as StdError;
     use std::convert::TryFrom;
+    use std::error::Error as StdError;
 
     #[cfg(target_pointer_width = "32")]
     #[test]