fix credo warnings

apps/indexer/lib/indexer/block/fetcher.ex

@@ -20,10 +20,10 @@ defmodule Indexer.Block.Fetcher do
     ContractCode,
     InternalTransaction,
     ReplacedTransaction,
+    StakingPools,
     Token,
     TokenBalance,
-    UncleBlock,
-    StakingPools
+    UncleBlock
   }
 
   alias Indexer.Tracer

apps/indexer/lib/indexer/fetcher/staking_pools.ex

@@ -9,8 +9,8 @@ defmodule Indexer.Fetcher.StakingPools do
   require Logger
 
   alias Explorer.Chain
-  alias Indexer.BufferedTask
   alias Explorer.Staking.PoolsReader
+  alias Indexer.BufferedTask
 
   @behaviour BufferedTask
 
@@ -24,7 +24,7 @@ defmodule Indexer.Fetcher.StakingPools do
   @max_retries 3
 
   @spec async_fetch() :: :ok
-  def async_fetch() do
+  def async_fetch do
     pid = GenServer.whereis(__MODULE__)
 
     if pid && Process.alive?(pid) do

apps/indexer/lib/indexer/supervisor.ex

@@ -16,11 +16,11 @@ defmodule Indexer.Supervisor do
     InternalTransaction,
     PendingTransaction,
     ReplacedTransaction,
+    StakingPools,
     Token,
     TokenBalance,
     TokenUpdater,
-    UncleBlock,
-    StakingPools
+    UncleBlock
   }
 
   alias Indexer.Temporary.{