v0.9.1 renders dot but names the output .html

[alesti]

What happened:

[130] % rbac-tool viz --outformat dot   
[alcide-rbactool] Namespaces included '*'
[alcide-rbactool] Namespaces excluded 'kube-system'
[alcide-rbactool] Connecting to cluster ''
[alcide-rbactool] Generating Graph and Saving as 'rbac.html'

[0] % head -2 rbac.html                                                                                   
digraph  {
        subgraph cluster_s296 {

What you expected to happen:
I expect to name a dot file .dot :-D

Looks like connected to issue 8

How to reproduce it (as minimally and precisely as possible):
rbac-tool viz --outformat dot

Anything else we need to know?:

Dot itself renders the file fine, it looks just like a file nameing error.

It would be also nice to see the used version at least in -h

Environment:

• Kubernetes version (use kubectl version): irrelevant, happens with 1.15.11 and also 1.18.x

[gadinaor]

Fixed in v0.10.0