Import Model Command Failing

[JakeNeyer]

litecow import-model --source https://github.com/onnx/models/blob/master/vision/object_detection_segmentation/tiny-yolov3/model/tiny-yolov3-11.onnx tinyyolov3
Traceback (most recent call last):
  File "/home/echavarria/anaconda3/envs/cowtest/bin/litecow", line 5, in <module>
    from litecow_models.cli import cli
  File "/home/echavarria/anaconda3/envs/cowtest/lib/python3.7/site-packages/litecow_models/cli.py", line 3, in <module>
    from litecow_models.model import ModelLoader, initialize_s3
  File "/home/echavarria/anaconda3/envs/cowtest/lib/python3.7/site-packages/litecow_models/model.py", line 13, in <module>
    from mypy_boto3_s3 import S3Client
  File "/home/echavarria/anaconda3/envs/cowtest/lib/python3.7/site-packages/mypy_boto3_s3/__init__.py", line 52, in <module>
    from .service_resource import S3ServiceResource
  File "/home/echavarria/anaconda3/envs/cowtest/lib/python3.7/site-packages/mypy_boto3_s3/service_resource.py", line 120, in <module>
    class ServiceResourceBucketsCollection(ResourceCollection["Bucket"]):
TypeError: 'type' object is not subscriptable