Include a serde feature in the shared crate

board-shared/src/game.rs

@@ -54,11 +54,7 @@ impl Hand {
     }
 
     pub fn remove(&mut self, idx: usize) -> Option<Tile> {
-        if idx < self.tiles.len() {
-            Some(self.tiles.remove(idx))
-        } else {
-            None
-        }
+        (idx < self.tiles.len()).then(|| self.tiles.remove(idx))
     }
 
     pub fn iter(&self) -> impl Iterator<Item = &Tile> {