Invoke Lambda policy not supported

My API Gateway function calls another Lambda function. While auto-generating policy document during `chalice deploy`, I get:

> Unsupported service: lambda

and the required policy is not added.

Relevant policy that should be added is:

```
{
"Version": "2012-10-17",
"Statement": [
...
{
"Effect": "Allow",
"Action": [
"lambda:InvokeFunction"
],
"Resource": [
"*"
]
}
]
}
```

Thanks.