redis over TLS?

Does dshackle support Redis connection over TLS? I can't seem to find that answer. Initial attempts don't seem to work but I'm not sure if I'm doing it right :smile:

I'm trying to deploy an Azure Redis Cache and by default TLS is enforced. So my connection string looks like:

```
.redis.cache.windows.net:6380,password=,ssl=True,abortConnect=False
```

And dshackle.yaml I got:

```
cache:
redis:
enabled: true
host: .redis.cache.windows.net
port: 6380
password: ""
```
Basically it hangs for a while, then throws an error, so I'm guessing it's not trying to use TLS? But I don't see a flag to enable it in the docs.

Thanks!