CompatHelper: bump compat for SpecialFunctions to 2, (keep existing compat)

[github-actions]

This pull request changes the compat entry for the SpecialFunctions package from 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 0.10, 1.0 to 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 0.10, 1.0, 2.
This keeps the compat entries for earlier versions.

Note: I have not tested your package with this new compat entry.
It is your responsibility to make sure that your package tests pass before you merge this pull request.

[KristofferC]

Oh, come on!!!!!!! 2.0 of SpecialFunctions for a technically breaking change.

[codecov-commenter]

Codecov Report

Merging #564 (d255014) into master (ab0e239) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #564   +/-   ##
=======================================
  Coverage   85.36%   85.36%           
=======================================
  Files           9        9           
  Lines         868      868           
=======================================
  Hits          741      741           
  Misses        127      127           

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[devmotion]

Looks good to me. I reran the tests to ensure that SpecialFunctions 2 is tested (DiffRules held it back initially). Unsurprisingly, tests did not fail.

[devmotion]

@KristofferC I saw that the master branch contains some unreleased changes (v0.10.23...master) and also updated the julia bound to 1.6. Is it OK to merge this PR and make a release? Or is there a reason why you haven't released these changes yet?

I mainly wonder since ForwardDiff (and possibly some other packages) hold back SpecialFunctions in the tests in Distributions. And since Distributions actually required some changes I would like to properly test the fixes before merging the SpecialFunctions update over there.

[ranocha]

Bump

[devmotion]

@KristofferC is it OK with you if we merge and make a new release? Since Julia 1.6 became the LTS in the mean time it seems we don't have to worry about dropping support for Julia < 1.6 anymore.

[KristofferC]

Yes, but I think I will revert the SIMD stuff now since I don't think it has been properly tested to go into a release.

[devmotion]

Thank you for releasing this PR @KristofferC!