2D Legendre transform

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.01 :tada:

Comparison is base (4593054) 96.19% compared to head (2f3d6de) 96.21%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #143 +/- ## ========================================== + Coverage 96.19% 96.21% +0.01% ========================================== Files 6 6 Lines 842 846 +4 ========================================== + Hits 810 814 +4 Misses 32 32 ``` | [Impacted Files](https://codecov.io/gh/JuliaApproximation/MultivariateOrthogonalPolynomials.jl/pull/143?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaApproximation) | Coverage Δ | | |---|---|---| | [src/MultivariateOrthogonalPolynomials.jl](https://codecov.io/gh/JuliaApproximation/MultivariateOrthogonalPolynomials.jl/pull/143?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaApproximation#diff-c3JjL011bHRpdmFyaWF0ZU9ydGhvZ29uYWxQb2x5bm9taWFscy5qbA==) | `100.00% <ø> (ø)` | | | [src/rect.jl](https://codecov.io/gh/JuliaApproximation/MultivariateOrthogonalPolynomials.jl/pull/143?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaApproximation#diff-c3JjL3JlY3Quamw=) | `94.82% <100.00%> (+0.38%)` | :arrow_up: | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaApproximation). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaApproximation)

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