Add Nim 1.6.6

[ee7]

Links:

• https://nim-lang.org/blog/2022/05/05/version-166-released.html
• https://forum.nim-lang.org/t/9144
• https://github.com/nim-lang/Nim/compare/v1.6.4...v1.6.6

---

Released 15 minutes ago.

Please double check that the nightlies link is correct. I think that it is:

$ cd /tmp
$ curl -sSfL -o 1.tar.xz https://github.com/nim-lang/nightlies/releases/download/2022-05-05-version-1-6-0565a70eab02122ce278b98181c7d1170870865c/nim-1.6.6-linux_x64.tar.xz
$ curl -sSfL -o 2.tar.xz https://nim-lang.org/download/nim-1.6.6-linux_x64.tar.xz
$ diff -s 1.tar.xz 2.tar.xz
Files 1.tar.xz and 2.tar.xz are identical
$ curl -sSfL -o 3.tar.xz https://github.com/nim-lang/nightlies/releases/download/2022-05-05-version-1-6-0565a70eab02122ce278b98181c7d1170870865c/nim-1.6.6-windows_x64.zip
$ curl -sSfL -o 4.tar.xz https://nim-lang.org/download/nim-1.6.6_x64.zip
$ diff -s 3.tar.xz 4.tar.xz
Files 3.tar.xz and 4.tar.xz are identical

Thanks for your work in this repo.

[iffy]

Yep, that's the right one! Thank you for sending this PR 🎉

I usually run ./getnightlies.sh to get the new one.