fix: Update .travis.yml format

[riddell-stan]

No description provided.

[ahartikainen]

C++ exception is not catched or something similar is going on. When inv file is not defined, it should just skip that part, now it send error to log and crashes in the return step.

[ahartikainen]

Latest manylinux2014 has dropped support for 2.7. Not sure about manylinux1.

And 2.7 is eol, and 2.19.1 wheel is in pypi.

[riddell-stan]

Let's get rid of it then.

[ahartikainen]

Do you want me to add a commit for it, or do you want to do it yourself?

[riddell-stan]

I'm fairly sure I screwed up and deleted some important patches I had to the default manylinux1 image. IIRC, unpatched multibuild does not build the linux wheels for pystan 2.19.1 due to the old version of gcc.

I'm really sorry about this! I might have time to look at this again after the next pystan 3 beta is out.

[ahartikainen]

These for some reason work

https://travis-ci.org/github/ahartikainen/pystan-wheels/builds/716910572
https://github.com/ahartikainen/pystan-wheels/pull/1/files

TBH not sure what all did I change, but I think I just manually forced manylinux1 (multibuild goes for manylinux2014)

[ahartikainen]

I added explicit line for manylinux1, let's see if that works.

[ahartikainen]

Everything else but this works

- os: linux
    env:
      - MB_PYTHON_VERSION=2.7
      - UNICODE_WIDTH=16

Reason for this is that pip upgrade fails.

Should we merge this and then decide what to do for py27.

(This pr uploads only wheels for 38)

[riddell-stan]

Removed all 2.7 versions and 3.5 too.