setup.cfg: Build wheel for Python 3.4-3.6 only

[jayvdb]

Fixes coala/coala#3383

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[sils]

ack 6f0db7b

[sils]

@rultor merge

[rultor]

@rultor merge

@sils OK, I'll try to merge now. You can check the progress of the merge here

[rultor]

@rultor merge

@sils Done! FYI, the full log is here (took me 1min)