Introduced macOS Catalina (10.15) support

[tib]

Hi,

first of all this library is amazing, congrats. 👍

I have a quick question about the upcoming version:
Is it possible to lower dependency so the lib could work with .macOS(.v10_15) as well?

Thanks.

Best,
Tib

[tib]

@malcommac I just created a PR for this issue, if you don't mind the change please be kind and merge.

Thank you. 😄

[malcommac]

merged and available since 1.2.1. thank you