always update setuptools before travis run

[gaborbernat]

resolves #656

[codecov]

Codecov Report

Merging #674 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #674   +/-   ##
=======================================
  Coverage   90.73%   90.73%           
=======================================
  Files          11       11           
  Lines        2363     2363           
  Branches      395      395           
=======================================
  Hits         2144     2144           
  Misses        144      144           
  Partials       75       75

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[cryvate]

Should this not be setuptools instead of six?

[gaborbernat]

@cryvate technically this is a pip issue, :-) and the underlying issue is already with six (which is a dependency of setuptools), so here I've treated just the bad part :-)

[cryvate]

@gaborbernat thanks, I didn't realise that was what was happening, for others interested, see pypa/setuptools#964

[rpkilby]

Hi @gaborbernat - I think you need to add the -U flag to the six install. If you look at the build output, it shows that the requirement is already satisfied (output) and noops. It doesn't upgrade until the tox install.

[rpkilby]

As evidence of this, see this build.