v0.3.15

ApproxFunSingularities v0.3.15

Diff since v0.3.13

Merged pull requests:

• Remove opt0 in downstream tests (#76) (@jishnub)
• Don't import gamma from ApproxFunBase (#77) (@jishnub)
• test elementwise equality in ChebyshevDirichlet Union (#78) (@jishnub)
• Add PkgEval badge to README.md (#79) (@jishnub)
• Concrete imports from IntervalSets (#80) (@jishnub)
• Add PkgEval badge to README.md (#81) (@jishnub)
• Cancel concurrent downstream tests (#82) (@jishnub)
• Map to canonical in weighted space display (#83) (@jishnub)