Update pyscaffold

[t-persson]

Applicable Issues

#51

Description of the Change

Update the version of PyScaffold to the latest version due to a problem with packaging.
I also removed python2 from tox since it is deprecated.
Note that most of this change is done with automation, using PyScaffold's own tools.

Alternate Designs

Due to a change in distutils and higher versions of Python we'll need to either update PyScaffold or find the exact package combination that works with our older version. I chose to update as it is more future proof.

Benefits

This will allow us to keep packaging Eiffellib.

Possible Drawbacks

I might have missed something. Python packaging is not my strong suit

Sign-off

Developer's Certificate of Origin 1.1

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(a) The contribution was created in whole or in part by me and I
have the right to submit it under the open source license
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(b) The contribution is based upon previous work that, to the best
of my knowledge, is covered under an appropriate open source
license and I have the right under that license to submit that
work with modifications, whether created in whole or in part
by me, under the same open source license (unless I am
permitted to submit under a different license), as indicated
in the file; or

(c) The contribution was provided directly to me by some other
person who certified (a), (b) or (c) and I have not modified
it.

(d) I understand and agree that this project and the contribution
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maintained indefinitely and may be redistributed consistent with
this project or the open source license(s) involved.

Signed-off-by: Tobias Persson [email protected]