Document dependency on swig on the installation instructions

[rcalsaverini]

Hello,
I had some trouble installing auto-sklearn and realized that the problem was that pyrfr depends on swig, and it actually requires swig3.0 and not swig2.0.

Perhaps a note in the installation instructions recommending Ubuntu users to run apt-get install swig and other distros to install swig 3.0.8 before installing the python dependecies would be nice.

[rcalsaverini]

I found the relevant part of the documentation and added a pull request.

Edit:

Nevermind, I'm stupid and didn't check the development branch. Will fix it in a moment. Removing the pull request for now.

[rcalsaverini]

Yep. SWIG is correctly mentioned in the development branch documentation. I just added a reference to the specific version pyrfr depends on (which is 3.0 or later) instructions on how to install it on ubuntu (since there are multiple SWIG packages on Ubuntu and this can cause confusion).

Sorry for the mess.

[mfeurer]

Okay, the actual issue is that the master doesn't specify a dependency on pyrfr==0.2.0, but only pyrfr. pip will then try to install pyrfr==0.4.0, which needs SWIG and won't work with the current auto-sklearn on pypi. Please install the latest version of auto-sklearn from the development branch as well.

Also, thanks a lot for providing a pull request.