bump compat for SpecialFunctions

[ranocha]

There was a new release of SpecialFunctions.jl and this packages holds back updates of some other packages downstream. I've made a PR adding CompatHelper to automate this process in the future, cf. #202.

[codecov]

Codecov Report

Merging #203 (77a714f) into master (61c3c91) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #203   +/-   ##
=======================================
  Coverage   88.97%   88.97%           
=======================================
  Files           9        9           
  Lines        1460     1460           
=======================================
  Hits         1299     1299           
  Misses        161      161           

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[jverzani]

Thanks!