cannot convert to support iOS 12

[MarcSteven]

🐞Describe the bug

A clear and brief description of what the bug is.
I wanna to convert to support iOS 12 but it shows the error "no implementation shape and gather "

Trace

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To Reproduce

• If a python script can reproduce the error, please paste the code snippet

from onnx_coreml import convert
# Paste code snippet here

• If applicable, please attach ONNX model
  • If model cannot be shared publicly, please attach it via filing a bug report at https://developer.apple.com/bug-reporting/
• If model conversion succeeds, however, there is numerical mismatch between the original and the coreml model, please paste python script used for comparison (pytorch code, onnx runtime code etc.)

System environment (please complete the following information):

• coremltools version (e.g., 3.0b5):
• onnx-coreml version (e.g. 1.0b2):
• OS (e.g., MacOS, Linux):
• macOS version (if applicable):
• How you install python (anaconda, virtualenv, system):
• python version (e.g. 3.7):
• any other relevant information:

Additional context

Add any other context about the problem here.

[DawerG]

@MarcSteven Shape and Gather operations are only available in iOS 13 and onwards. Closing the issue for now.