rustfmt to reformat imports

(with rustls's config)

src/lib.rs

@@ -60,6 +60,12 @@ extern crate std;
 mod tests;
 
 mod pemfile;
+#[cfg(feature = "std")]
+use core::iter;
+/// --- Legacy APIs:
+#[cfg(feature = "std")]
+use std::io;
+
 #[cfg(feature = "std")]
 pub use pemfile::{read_all, read_one};
 pub use pemfile::{read_one_from_slice, Error, Item};
@@ -71,12 +77,6 @@ use pki_types::{
     PrivatePkcs8KeyDer, PrivateSec1KeyDer, SubjectPublicKeyInfoDer,
 };
 
-#[cfg(feature = "std")]
-use core::iter;
-/// --- Legacy APIs:
-#[cfg(feature = "std")]
-use std::io;
-
 /// Return an iterator over certificates from `rd`.
 ///
 /// Filters out any PEM sections that are not certificates and yields errors if a problem