Newbie issue with IAMs - could be related to other bugs

[springcoil]

Context

I get the following error.

Error: Failed to manage IAM roles!
You may lack the necessary AWS permissions to automatically manage a Zappa execution role.
To fix this, see here: https://github.com/Miserlou/Zappa#using-custom-aws-iam-roles-and-policies```

It works with my default AWS profile, but not the following. 

```{
    "dev": {
        "profile_name": "springcoil",
        "project_name": "weather_london",
        "s3_bucket": "zappa-abcdefg123",
        "events": [{
           "function": "tweet.check_time_and_post",
           "expression": "cron(30 * * * ? *)"
        }],
        "environment_variables": {
            "DS_KEY": "...",
            "TW_CONSUMERKEY": "...",
            "TW_CONSUMERKEYSECRET": "...",
            "TW_ACCESSTOKEN": "...",
            "TW_ACCESSTOKENSECRET": "...",
            "DWX_LATITUDE": "...",
            "DWX_LONGITUDE": "...",
            "DWX_TZ": "Europe/London"
        }
    }
}   ```

<!--- Provide a more detailed introduction to the issue itself, and why you consider it to be a bug -->
<!--- Also, please make sure that you are running Zappa _from a virtual environment_ and are using Python 2.7/3.6 -->

## Expected Behavior
I changed the IAM roles etc as described in https://github.com/Miserlou/Zappa/issues/244 but found it didn't work.
## Actual Behavior
<!--- Tell us what happens instead -->

## Possible Fix
<!--- Not obligatory, but suggest a fix or reason for the bug -->

## Steps to Reproduce
<!--- Provide a link to a live example, or an unambiguous set of steps to -->
<!--- reproduce this bug include code to reproduce, if relevant -->
1.
2.
3.

## Your Environment
<!--- Include as many relevant details about the environment you experienced the bug in -->
* Zappa version used:
* Operating System and Python version: MacOSX and python 3.6
* The output of `pip freeze`:
```argcomplete==1.9.3
base58==1.0.0
boto3==1.9.10
botocore==1.12.10
certifi==2018.8.24
cfn-flip==1.0.3
chardet==3.0.4
click==6.7
docutils==0.14
durationpy==0.5
future==0.16.0
hjson==3.0.1
idna==2.5
jmespath==0.9.3
kappa==0.6.0
lambda-packages==0.20.0
oauthlib==2.1.0
placebo==0.8.2
PySocks==1.6.8
python-dateutil==2.6.1
python-slugify==1.2.4
pytz==2017.2
PyYAML==3.12
requests==2.18.2
requests-oauthlib==1.0.0
s3transfer==0.1.13
six==1.11.0
toml==0.9.6
tqdm==4.19.1
troposphere==2.3.3
tweepy==3.6.0
Unidecode==1.0.22
urllib3==1.22
Werkzeug==0.14.1
wsgi-request-logger==0.4.6
zappa==0.46.2```

* Link to your project (optional):
* Your `zappa_settings.py`: 

My iam policy - 
```{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": [
                "iam:GetRole",
                "iam:PutRolePolicy"
            ],
            "Resource": [
                "*"
            ]
        },
        {
            "Effect": "Allow",
            "Action": [
                "iam:PassRole"
            ],
            "Resource": [
                "arn:aws:iam::126227402951:role/ZappaLambdaExecution"
            ]
        },
        {
            "Effect": "Allow",
            "Action": [
                "apigateway:DELETE",
                "apigateway:GET",
                "apigateway:PATCH",
                "apigateway:POST",
                "apigateway:PUT",
                "events:DeleteRule",
                "events:DescribeRule",
                "events:ListRules",
                "events:ListTargetsByRule",
                "events:PutRule",
                "events:PutTargets",
                "events:RemoveTargets",
                "lambda:AddPermission",
                "lambda:CreateFunction",
                "lambda:DeleteFunction",
                "lambda:GetFunction",
                "lambda:GetPolicy",
                "lambda:ListVersionsByFunction",
                "lambda:RemovePermission",
                "lambda:UpdateFunctionCode",
                "lambda:UpdateFunctionConfiguration",
                "cloudformation:CreateStack",
                "cloudformation:DeleteStack",
                "cloudformation:DescribeStackResource",
                "cloudformation:DescribeStacks",
                "cloudformation:ListStackResources",
                "cloudformation:UpdateStack",
                "logs:DescribeLogStreams",
                "logs:FilterLogEvents"
            ],
            "Resource": [
                "*"
            ]
        },
        {
            "Effect": "Allow",
            "Action": [
                "s3:ListBucket"
            ],
            "Resource": [
                "arn:aws:s3:::zappa-abcdefg123"
            ]
        },
        {
            "Effect": "Allow",
            "Action": [
                "s3:DeleteObject",
                "s3:GetObject",
                "s3:PutObject",
                "s3:CreateMultipartUpload",
                "s3:AbortMultipartUpload",
                "s3:ListMultipartUploadParts",
                "s3:ListBucketMultipartUploads"
            ],
            "Resource": [
                "arn:aws:s3:::zappa-abcdefg123/*"
            ]
        }
    ]
}``` 

[springcoil]

I believe #244 might be related but I tried those fixes to no avail.