Incompatible with Ruby 2.7

[autarchprinceps]

Whenever I try to use sfn with ruby 2.7, it completely breaks for all commands. If I switch back to ruby 2.6.5 it works in the same situations. Both run sfn 3.1.8 and should also have otherwise the current versions of gems.

Error message is:

sfn list
[ERROR]: Failed to create remote API connection. Please validate configuration!
[ERROR]: Connection failure reason - FrozenError - can't modify frozen String: ""
[ERROR]: can't modify frozen String: ""

[runningman84]

@chrisroberts can you look into that?

[runningman84]

We build a new sfn tool based on rust, this works without any ruby installation:
https://github.com/arvatoaws-labs/sfn-ng