Ignore ApproxFunBaseTest as a dep

[jishnub]

This lets one carry out downstream tests in ApproxFunBaseTest by developing the package, without being flagged by Aqua.

[codecov]

Codecov Report

Base: 61.05% // Head: 67.10% // Increases project coverage by +6.05% 🎉

Coverage data is based on head (ed9e86e) compared to base (864d832).
Patch coverage: 83.67% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #177      +/-   ##
==========================================
+ Coverage   61.05%   67.10%   +6.05%     
==========================================
  Files          28       28              
  Lines        2488     2493       +5     
==========================================
+ Hits         1519     1673     +154     
+ Misses        969      820     -149     

Impacted Files	Coverage Δ
src/ApproxFunOrthogonalPolynomials.jl	66.66% <ø> (ø)
src/Spaces/Chebyshev/Chebyshev.jl	59.57% <ø> (+1.41%)	⬆️
src/Spaces/Hermite/Hermite.jl	70.51% <ø> (+21.79%)	⬆️
src/Spaces/Laguerre/Laguerre.jl	60.13% <ø> (+1.35%)	⬆️
src/Spaces/Jacobi/Jacobi.jl	65.04% <66.66%> (+1.94%)	⬆️
src/Spaces/Jacobi/JacobiOperators.jl	80.30% <81.48%> (+12.88%)	⬆️
src/Spaces/PolynomialSpace.jl	89.10% <91.66%> (+0.70%)	⬆️
src/Spaces/Ultraspherical/Ultraspherical.jl	79.31% <100.00%> (+1.72%)	⬆️
...c/Spaces/Ultraspherical/UltrasphericalOperators.jl	76.37% <0.00%> (-3.30%)	⬇️
... and 16 more

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