Feature/use latest io ts

[twonamejames]

This change upgrades the versions of io-ts and fp-ts to version 2. This is to fix type errors caused by incompatible versions of fp-ts and io-ts in a project I'm working on that has dependencies on version 2 of both packages as well as this package.

I also took the opportunity to update any outdated packages that could be updated without breaking.

Luckily only a few things broke when upgrading io-ts to version 2. I only fixed errors reported by tsc. I don't know if other issues still exist, but all the tests seem to be passing.

Because I believe this is a breaking change, I bumped the major version of this package as well.

[codecov[bot]]

Codecov Report

Merging #26 into 4.0.0 will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##            4.0.0      #26   +/-   ##
=======================================
  Coverage   98.60%   98.60%           
=======================================
  Files         684      684           
  Lines       10425    10425           
  Branches      301      301           
=======================================
  Hits        10280    10280           
  Misses        144      144           
  Partials        1        1           

---

Continue to review full report at Codecov.

Legend - Click here to learn more Δ = absolute <relative> (impact), ø = not affected, ? = missing data Powered by Codecov. Last update 9546bc7...7f4d487. Read the comment docs.

[Ahryman40k]

Hi @twonamejames, Thank you for the update. Indeed it was a job I need to do. I agree with everything except the library version., It will be nice if it can stay on version 4. All your changes doesn't break FHIR objects so it's still R4. I did myself a mistake with FHIR version and I'm waiting next release to fix it. Indeed, my lib should have been in version 4.0.0.x then in version 4.0.1.x but I missed a '0'. Can you just increase the patch number ?

Thank for you contribution and your time :)

[Ahryman40k]

Thank you very much for this !