fix clippy warning

Stephan Dilly · Stephan Dilly · commit 5b25abace5c1 · 2020-05-10T10:10:15.000+02:00
diff --git a/src/components/diff.rs b/src/components/diff.rs
@@ -24,6 +24,7 @@ struct Current {
     hash: u64,
 }
 
+#[derive(Copy, Clone)]
 enum ScrollType {
     Up,
     Down,
