I had to make two changes to update from swift 4.2 to 5 and they were both trivial tweaks to fix warnings, rather than hard errors. Each version up to 2 had a

I had to make two changes to update from swift 4.2 to 5 and they were both trivial tweaks to fix warnings, rather than hard errors. Each version up to 2 had a lot of language breaking changes, 3 had incredibly rough standard library changes, and everything since then has been about 5 minutes of work.