v0.5.1

SemiclassicalOrthogonalPolynomials v0.5.1

Diff since v0.5.0

Merged pull requests:

• Add L'L test (#84) (@dlfivefifty)
• Undo my change in sum(P::SemiclassicalJacobiWeight{T}) (#86) (@ioannisPApapadopoulos)
• Reduce cost of weighted lowering (#87) (@TSGut)
• ContinuumArrays v0.15 (#88) (@dlfivefifty)