fix credo

apps/explorer/lib/explorer/chain.ex

@@ -2622,8 +2622,8 @@ defmodule Explorer.Chain do
 
     today = Date.to_string(NaiveDateTime.utc_now())
 
-    if Enum.count(result) > 0 && !Enum.any?(result, fn map -> map[:data] == today end) do
+    if Enum.count(result) > 0 && !Enum.any?(result, fn map -> map[:date] == today end) do
-      result ++ [%{date: today, value: List.last(result)[:value]}]
+      [%{date: today, value: List.last(result)[:value]} | result]
     else
       result
     end

apps/explorer/test/explorer/chain_test.exs

@@ -3677,8 +3677,8 @@ defmodule Explorer.ChainTest do
       balances = Chain.address_to_balances_by_day(address.hash)
 
       assert balances == [
-               %{date: "2019-04-14", value: Decimal.new("1E-15")},
+               %{date: "2019-04-15", value: Decimal.new("1E-15")},
-               %{date: "2019-04-15", value: Decimal.new("1E-15")}
+               %{date: "2019-04-14", value: Decimal.new("1E-15")}
              ]
     end
   end