trafaret/Enum: support Python >=3.4 `enum` module#67

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spumer wants to merge 3 commits intoDeepwalker:masterfrom

Commits on Jun 6, 2017

guard: support keyword-only and annotated functions (Py3)
spumer
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Commits on Jun 20, 2017

Merge remote-tracking branch 'upstream/master'
spumer
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Commits on Sep 28, 2017

trafaret/Enum: support Python >=3.4 `enum` module
spumer
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