Fixed according to cargo fmt

hotman78 · hotman78 · commit ec563d300df6 · 2020-09-08T14:27:03.000+09:00
diff --git a/src/dsu.rs b/src/dsu.rs
@@ -9,7 +9,6 @@ pub struct Dsu {
     parent_or_size: Vec<i32>,
 }
 
-
 impl Dsu {
     pub fn new(size: usize) -> Self {
         Self {
