fixes failing CI and adds 26.0 warning

README.md

@@ -4,6 +4,11 @@
 
 ![example workflow](https://github.com/E-xyza/exonerate/actions/workflows/elixir.yml/badge.svg)
 
+## Erlang 26.0 warning
+
+There is a bug in the Erlang compiler that causes Exonerate to fail on OTP version 26.0.  Please use
+26.1 or an earlier version or OTP.
+
 ## Documentation
 
 Documentation is available at: https://hexdocs.pm/exonerate

test/errors/ref_not_found_test.exs

@@ -1,9 +1,15 @@
 defmodule ExonerateTest.RefNotFoundTest do
   use ExUnit.Case, async: true
 
+  @error_string if Version.compare(Version.parse!(System.version()), %Version{major: 1, minor: 15, patch: 0}) == :lt do
+    " reference points to: #/definitions/foo, this location not found in the schema"
+  else
+    "reference points to: #/definitions/foo, this location not found in the schema"
+  end
+
   test "if there's a missing ref, we get a CompileError" do
     assert_raise CompileError,
-                 "reference points to: #/definitions/foo, this location not found in the schema",
+                 @error_string,
                  fn ->
                    __DIR__
                    |> Path.join("ref_not_found_root.exs")