Error when using a region with less than 3 availability zones

[RustamovAzer]

What happened:

I ran into an error during opta apply:

ERROR:  Opta requires a region with at least *3* availability zones.
You configured us-west-1, which only has the availability zones: ['us-west-1a', 'us-west-1c'].
Please choose a different region.

What you expected to happen:

I think it should be mentioned in Getting Started that you need a region with at least 3 availability zones.

Environment:

• Opta version (use opta version): v0.24.3
• Cloud provider (or hardware configuration for local): AWS
• OS (e.g: cat /etc/os-release): Ubuntu 20.04
• Kernel (e.g. uname -a):
• Install tools:
• Others:

[ankurd1]

Ah you're right. We should add this to the documentation. We will also re-evaluate if it's possible to support such regions.