Use MergeableQueue:default() instead of ::new

Author: Sakib25800

src/bors/context.rs

@@ -24,7 +24,7 @@ impl BorsContext {
             parser,
             db,
             repositories,
-            mergeable_queue: Arc::new(MergeableQueue::new()),
+            mergeable_queue: Arc::new(MergeableQueue::default()),
         }
     }
 }

src/bors/mergeable_queue.rs

@@ -33,3 +33,9 @@ impl MergeableQueue {
         }
     }
 }
+
+impl Default for MergeableQueue {
+    fn default() -> Self {
+        Self::new()
+    }
+}