Use regex in error test

Author: alisinabh

test/ethers/revert_contract_test.exs

@@ -20,7 +20,7 @@ defmodule Ethers.RevertContractTest do
       assert message =~ "success must be true"
 
       assert_raise Ethers.ExecutionError,
-                   "execution reverted: success must be true",
+                   ~r/execution reverted: (?:revert: )?success must be true/,
                    fn ->
                      RevertContract.get(false) |> Ethers.call!(to: address, from: @from)
                    end