chore: bump compiler version and clippy fixes (#105)

Signed-off-by: Alex Chi Z <iskyzh@gmail.com>

mini-lsm/src/compact/tiered.rs

@@ -86,7 +86,7 @@ impl TieredCompactionController {
             .len()
             .min(self.options.max_merge_width.unwrap_or(usize::MAX));
         println!("compaction triggered by reducing sorted runs");
-        return Some(TieredCompactionTask {
+        Some(TieredCompactionTask {
             tiers: snapshot
                 .levels
                 .iter()
@@ -94,7 +94,7 @@ impl TieredCompactionController {
                 .cloned()
                 .collect::<Vec<_>>(),
             bottom_tier_included: snapshot.levels.len() >= num_tiers_to_take,
-        });
+        })
     }
 
     pub fn apply_compaction_result(

mini-lsm/src/lsm_iterator.rs

@@ -99,7 +99,10 @@ impl<I: StorageIterator> FusedIterator<I> {
 }
 
 impl<I: StorageIterator> StorageIterator for FusedIterator<I> {
-    type KeyType<'a> = I::KeyType<'a> where Self: 'a;
+    type KeyType<'a>
+        = I::KeyType<'a>
+    where
+        Self: 'a;
 
     fn is_valid(&self) -> bool {
         !self.has_errored && self.iter.is_valid()