Update of torch version

[stefan-it]

Hi,

I'm currently running flair in a nvidia-docker flavoured container using pyenv and Python 3.7. When installing flair via pip (or from source via pip install -e .) the following error message appears:

root@599cf5a2dde2:~/flair# pip install flair
Collecting flair
  Downloading https://files.pythonhosted.org/packages/1f/08/b2bdb5ef305227a7dacfc69b0c16689de21e70b9d76e3d07eefa1690311b/flair-0.1.1.tar.gz
Collecting torch==0.4.0 (from flair)
  Could not find a version that satisfies the requirement torch==0.4.0 (from flair) (from versions: 0.1.2, 0.1.2.post1, 0.4.1, 0.4.1.post2)
No matching distribution found for torch==0.4.0 (from flair)
You are using pip version 10.0.1, however version 18.0 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.

With 0.4.1.post2 training runs perfectly, so I would like to ask if we can bump the Torch version?

Notice: using 0.4.1 has a strange numpy bug, which is discussed here.

[alanakbik]

I think we can bump the version for release 0.3!

[tabergma]

Torch version updated on release-0.3 branch, will be included in the next release.