support specialfunctions 2.x

[stevengj]

The only breaking change in SpecialFunctions 2.0 was deleting the factorial(x::Real) = gamma(x+1) function, and since you don't use factorial this shouldn't affect you.

[codecov]

Codecov Report

Merging #36 (816a9ae) into master (7820cb3) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #36   +/-   ##
=======================================
  Coverage   43.31%   43.31%           
=======================================
  Files          22       22           
  Lines        3121     3121           
=======================================
  Hits         1352     1352           
  Misses       1769     1769           

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[stevengj]

Closing in favor of #35.

[RafaelArutjunjan]

Thanks, I added the compatibility with v2 of SpecialFunctions.jl for v1.10.0 which I just registered, so this should be fixed next time you update