Automatically group imports using nightly rustfmt

src/aheader.rs

@@ -2,11 +2,12 @@
 //!
 //! Parse and create [Autocrypt-headers](https://autocrypt.org/en/latest/level1.html#the-autocrypt-header).
 
-use anyhow::{bail, Context as _, Error, Result};
 use std::collections::BTreeMap;
 use std::fmt;
 use std::str::FromStr;
 
+use anyhow::{bail, Context as _, Error, Result};
+
 use crate::key::{DcKey, SignedPublicKey};
 
 /// Possible values for encryption preference