name 'prefix' is not defined

https://github.com/aws-samples/easy-amazon-sagemaker-deployments/blob/58e943abca803f802eba0bcffffd3fd9f98c8162/ezsmdeploy/__init__.py#L359

Getting the error when making a deployment with:

```python
import ezsmdeploy
ezonsm = ezsmdeploy.Deploy(model = None,
script = 'inference.py',
requirements = ['numpy','scipy','tensorflow'],
name = 'diffdl-container-gpu',
wait = True,
image = 'tensorflow/tensorflow:latest-gpu',
instance_type = 'ml.g4dn.xlarge',
monitor = True)
```