Add check to prevent IPv6 connection issue with localhost on MacOS

[merowinger92]

Replicating the Pull Request from Serverless Localstack Wrapper:

• https://github.com/localstack/serverless-localstack/pull/205/files

[whummer]

Great catch, thanks for fixing this @merowinger92 ! 🚀

My only feedback would be that we could cache the local endpoint once it's been resolved (by using some global variable), as getLocalHost(..) is called several times during the execution lifecycle. Do you think we could still add that as part of this PR?

Also, would be great if you could bump the version in package.json and add a short note to the Change Log section in the README, so we can release this right away. Thanks! 🙌

(Side note: failing Go integration test seems to be unrelated to these changes, we'll look into that separately..)

/cc @dominikschubert

[merowinger92]

Hi @whummer!

I adapted the PR with your remarks.

Fixes #78

[whummer]

Awesome, thanks for the quick turnaround! We'll release this to npm right away.. 👍