Fixed linter errors

src/config.rs

@@ -773,7 +773,7 @@ pub enum DefaultShard {
     Shard(usize),
     Random,
     RandomHealthy,
-    Fail
+    Fail,
 }
 impl Default for DefaultShard {
     fn default() -> Self {

src/errors.rs

@@ -30,7 +30,7 @@ pub enum Error {
     QueryRouterError(String),
     InvalidShardId(usize),
     PreparedStatementError,
-    NoShardSelected
+    NoShardSelected,
 }
 
 #[derive(Clone, PartialEq, Debug)]

src/pool.rs

@@ -719,8 +719,8 @@ impl ConnectionPool {
                             .partial_cmp(&a.error_count.load(Ordering::Relaxed))
                             .unwrap()
                     });
-                },
-                DefaultShard::Fail => return Err(Error::NoShardSelected)
+                }
+                DefaultShard::Fail => return Err(Error::NoShardSelected),
             },
         };