workaround for pipenv install error; fixes #80

[bast]

see also pypa/pipenv#3224

@stigrj @robertodr

[codecov-io]

Codecov Report

Merging #81 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #81   +/-   ##
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  Coverage   44.37%   44.37%           
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  Files          78       78           
  Lines        1839     1839           
=======================================
  Hits          816      816           
  Misses       1023     1023

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[robertodr]

Thanks for the fix! Would you mind trying this approach: https://github.com/dev-cafe/cmake-cookbook/blob/master/.travis.yml#L105-L115 We invalidate PYENV_ROOT and then fix the version of Python to its absolute location on the Travis worker. It could get hairy with Python 2 support though. OT question: should we deprecate Python 2? I am fine with dropping it completely as of right now, for the record.

[chjacob-tubs]

Unfortunately, I still rely on Python 2 support in XcFun for PyADF. This is on the ToDo list, but requires some significant work.

[bast]

As to PYENV_ROOT: I would recommend to do this in a separate PR. My todo list is not pretty and I cannot dedicate more time to this today.