Extend external reward types up to 20

CHANGELOG.md

@@ -17,6 +17,7 @@
 - [#2803](https://github.com/poanetwork/blockscout/pull/2803) - Fix block validator custom tooltip
 
 ### Chore
+- [#2844](https://github.com/poanetwork/blockscout/pull/2844) - Extend external reward types up to 20
 - [#2827](https://github.com/poanetwork/blockscout/pull/2827) - Node js 12.13.0 (latest LTS release) support
 - [#2818](https://github.com/poanetwork/blockscout/pull/2818) - allow hiding marketcap percentage
 - [#2817](https://github.com/poanetwork/blockscout/pull/2817) - move docker integration documentation to blockscout docs

apps/ethereum_jsonrpc/lib/ethereum_jsonrpc/parity/fetched_beneficiaries.ex

@@ -180,6 +180,16 @@ defmodule EthereumJSONRPC.Parity.FetchedBeneficiaries do
   defp get_address_type(reward_type, index) when reward_type == "external" and index == 8, do: :validator
   defp get_address_type(reward_type, index) when reward_type == "external" and index == 9, do: :validator
   defp get_address_type(reward_type, index) when reward_type == "external" and index == 10, do: :validator
+  defp get_address_type(reward_type, index) when reward_type == "external" and index == 11, do: :validator
+  defp get_address_type(reward_type, index) when reward_type == "external" and index == 12, do: :validator
+  defp get_address_type(reward_type, index) when reward_type == "external" and index == 13, do: :validator
+  defp get_address_type(reward_type, index) when reward_type == "external" and index == 14, do: :validator
+  defp get_address_type(reward_type, index) when reward_type == "external" and index == 15, do: :validator
+  defp get_address_type(reward_type, index) when reward_type == "external" and index == 16, do: :validator
+  defp get_address_type(reward_type, index) when reward_type == "external" and index == 17, do: :validator
+  defp get_address_type(reward_type, index) when reward_type == "external" and index == 18, do: :validator
+  defp get_address_type(reward_type, index) when reward_type == "external" and index == 19, do: :validator
+  defp get_address_type(reward_type, index) when reward_type == "external" and index == 20, do: :validator
   defp get_address_type(reward_type, _index) when reward_type == "block", do: :validator
   defp get_address_type(reward_type, _index) when reward_type == "uncle", do: :uncle
   defp get_address_type(reward_type, _index) when reward_type == "emptyStep", do: :validator