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 #133 (7891518) into master (1492680) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #133   +/-   ##
=======================================
  Coverage   45.86%   45.86%           
=======================================
  Files          63       63           
  Lines        3203     3203           
=======================================
  Hits         1469     1469           
  Misses       1734     1734           

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[JeffreySarnoff]

thanks

[stevengj]

(At some point you should bump the version in Project.toml and tag a release.)

[JeffreySarnoff]

yup done thank you