ENH: use pytest instead of numpy for tests#28

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ankostis wants to merge 4 commits intoyahoo:masterfrom

ankostis:chore-pytest

Commits on Sep 28, 2019

FIX(build): py2 needs pinning networkx-2.2
ankostis
committed

Commits on Oct 3, 2019

Commits on Oct 4, 2019

enh(build,ci): use pytest in travis
ankostis
committed