message: improved usage message for 'require-env'
diff: @@ -526,7 +526,7 @@ void SQLLogicTestRunner::ExecuteFile(string script) {
  }
  if (token.parameters.size() != 1 && token.parameters.size() != 2) {
  - parser.Fail("require-env requires 2 arguments: <env name> <env value>");
  + parser.Fail("require-env requires 1 argument: <env name> [optional: <expected env val>]");
  }
  auto env_var = token.parameters[0];
  