IAMPolicyStatement in [APIGatewayCustomAuthorizerPolicy](https://github.com/aws/aws-lambda-dotnet/blob/master/Libraries/src/Amazon.Lambda.APIGatewayEvents/APIGatewayCustomAuthorizerPolicy.cs) is missing the `Condition` element, as [described in the IAM user guide](https://docs.aws.amazon.com/IAM/latest/UserGuide/reference_policies_elements_statement.html).