s3 location for AWS policy throws AccessDenied

After installing `iamctl`, running with `init` fails with `AccessDenied` on the AWS policy download from s3. The file [https://awspolicygen.s3.amazonaws.com/js/policies.js](URL) mentioned in README.rst is available via browser.

```
host:src $ iamctl init
____ __ __ __ ___ ____ __
(_ _) /__\ ( \/ )/ __)(_ _)( )
_)(_ /(__)\ ) (( (__ )( )(__
(____)(__)(__)(_/\/\_)\___) (__) (____)

Initializing
Downloading IAM file from awspolicygen S3 Bucket: iam.json
Traceback (most recent call last):
File "/usr/local/bin/iamctl", line 24, in
sys.exit(main())
File "/usr/local/bin/iamctl", line 20, in main
return iamctl.iamctl.main()
File "/usr/local/lib/python3.7/site-packages/iamctl/iamctl.py", line 153, in main
globals()[kwargs.pop('subparser')](**kwargs)
File "/usr/local/lib/python3.7/site-packages/iamctl/iamctl.py", line 87, in init
response = s3.get_object(Bucket="awspolicygen", Key="js/policies.js")
File "/usr/local/lib/python3.7/site-packages/botocore/client.py", line 357, in _api_call
return self._make_api_call(operation_name, kwargs)
File "/usr/local/lib/python3.7/site-packages/botocore/client.py", line 661, in _make_api_call
raise error_class(parsed_response, operation_name)
botocore.exceptions.ClientError: An error occurred (AccessDenied) when calling the GetObject operation: Access Denied
```

Start in iamctl.py at the init function and compare its S3 policy location with the URL documented in README.rst. Reproduce the iamctl init failure and inspect the AWS response; done means init can download the policy file without AccessDenied.

Written by the indexing model from the issue text.