Changes to describe_instances / describe_instances_basic:

[jamiesonio]

Hi,

I added some quality of life features for describing instances, let me know if this is useful.

• Add exception handling for "OptInRequired"
• Continue on region error
• Print region when exception is thrown

[jamiesonio]

This should also cover #54

[cktricky]

Thanks so much @jamiesonio 🎉. This looks great and should help close out #54 as you mentioned 👍 💯