Format with rustfmt (#389)

* Format with rustfmt

* Add rustfmt check to CI

tests/test_bytes.rs

@@ -1,6 +1,6 @@
 #![deny(warnings, rust_2018_idioms)]
 
-use bytes::{Bytes, BytesMut, Buf, BufMut};
+use bytes::{Buf, BufMut, Bytes, BytesMut};
 
 use std::usize;
 
@@ -44,7 +44,6 @@ fn test_layout() {
         mem::size_of::<Option<BytesMut>>(),
         "BytesMut should be same size as Option<BytesMut>",
     );
-
 }
 
 #[test]
@@ -87,13 +86,11 @@ fn fmt_write() {
     write!(a, "{}", &s[..64]).unwrap();
     assert_eq!(a, s[..64].as_bytes());
 
-
     let mut b = BytesMut::with_capacity(64);
     write!(b, "{}", &s[..32]).unwrap();
     write!(b, "{}", &s[32..64]).unwrap();
     assert_eq!(b, s[..64].as_bytes());
 
-
     let mut c = BytesMut::with_capacity(64);
     write!(c, "{}", s).unwrap();
     assert_eq!(c, s[..].as_bytes());
@@ -305,11 +302,13 @@ fn split_off_to_at_gt_len() {
 
     assert!(panic::catch_unwind(move || {
         let _ = make_bytes().split_to(5);
-    }).is_err());
+    })
+    .is_err());
 
     assert!(panic::catch_unwind(move || {
         let _ = make_bytes().split_off(5);
-    }).is_err());
+    })
+    .is_err());
 }
 
 #[test]
@@ -864,7 +863,6 @@ fn slice_ref_works() {
     test_slice_ref(&bytes, 9, 9, b"");
 }
 
-
 #[test]
 fn slice_ref_empty() {
     let bytes = Bytes::from(&b""[..]);