MOE 1.4.0 with Xcode 9 support is available for testing

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In our case, the interface AVCaptureMetadataOutputObjectsDelegate changed from

public void captureOutputDidOutputMetadataObjectsFromConnection(
AVCaptureOutput captureOutput, NSArray<?> metadataObjects, AVCaptureConnection connection )

to

public void captureOutputDidOutputMetadataObjectsFromConnection(
AVCaptureOutput output, NSArray<? extends AVMetadataObject> metadataObjects, AVCaptureConnection connection )

give us the same compile error after upgrade to 1.4.