v0.6.7

ApproxFunOrthogonalPolynomials v0.6.7

Diff since v0.6.6

Merged pull requests:

• Ignore ApproxFunBaseTest as a dep (#177) (@jishnub)
• Relax type in nD Tensorizer test (#178) (@jishnub)
• Test for inference in block for sumspace (#179) (@jishnub)
• Tests for inference in TensorSpace (#180) (@jishnub)
• Add test for ProductSpace domain (#181) (@jishnub)
• Module in runtests (#182) (@jishnub)
• isdiag for known derivatives (#183) (@jishnub)