fix fmt not caught locally

Author: bobhy

guide/src/lib.rs

@@ -1,10 +1,8 @@
 // no code yet?
 #![allow(unused)]
 use mdbook;
-use serde_json;
 use pulldown_cmark;
 use pulldown_cmark_to_cmark;
+use serde_json;
 
-pub fn marco() {
-    
-}
+pub fn marco() {}