Fix 0.7 depwarns

[yuyichao]

No description provided.

[codecov-io]

Codecov Report

Merging #64 into master will not change coverage.
The diff coverage is 40.54%.

@@           Coverage Diff           @@
##           master      #64   +/-   ##
=======================================
  Coverage   30.07%   30.07%           
=======================================
  Files         292      292           
  Lines        3578     3578           
=======================================
  Hits         1076     1076           
  Misses       2502     2502

Impacted Files	Coverage Δ
src/GSL.jl	88.88% <ø> (ø)	⬆️
src/6_5_GeneralPolynomialEquations.jl	0% <0%> (ø)	⬆️
src/20_23_SphericalVectorDistributions.jl	0% <0%> (ø)	⬆️
src/6_4_CubicEquations.jl	0% <0%> (ø)	⬆️
src/6_3_QuadraticEquations.jl	0% <0%> (ø)	⬆️
src/7_5_Bessel_Functions.jl	100% <100%> (ø)	⬆️
src/_7_24_1_Legendre_Polynomials.jl	100% <100%> (ø)	⬆️
src/7_20_Gegenbauer_Functions.jl	100% <100%> (ø)	⬆️
src/_28_1_Functions.jl	100% <100%> (ø)	⬆️
...ed_Legendre_Polynomials_and_Spherical_Harmonics.jl	94.11% <100%> (ø)	⬆️

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