union rule for Chebyshev and Jacobi

[jishnub]

Fixes

julia> S = Chebyshev(0..1)
Chebyshev(0..1)

julia> union(S, setdomain(Jacobi(S), 1..2))
Jacobi(-0.5,-0.5,0..1)⨄Jacobi(-0.5,-0.5,1..2)

julia> union(Chebyshev(0..1), Legendre(1..2))
Chebyshev(0..1)⨄Legendre(1..2)

[codecov]

Codecov Report

Merging #83 (39d41fd) into master (81e2851) will increase coverage by 0.07%.
The diff coverage is 90.00%.

❗ Current head 39d41fd differs from pull request most recent head e95630b. Consider uploading reports for the commit e95630b to get more accurate results

@@            Coverage Diff             @@
##           master      #83      +/-   ##
==========================================
+ Coverage   57.41%   57.48%   +0.07%     
==========================================
  Files          27       27              
  Lines        2402     2406       +4     
==========================================
+ Hits         1379     1383       +4     
  Misses       1023     1023              

Impacted Files	Coverage Δ
src/Spaces/Jacobi/JacobiOperators.jl	54.27% <90.00%> (+0.60%)	⬆️

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