Fix for Python 2.7.10

[janislejins]

Python 2.7.10 (default, Jul 14 2015, 19:46:27)
[GCC 4.2.1 Compatible Apple LLVM 6.0 (clang-600.0.39)] on darwin
Type "help", "copyright", "credits" or "license" for more information.

import slugify
Traceback (most recent call last):
File "", line 1, in
File "/Library/Python/2.7/site-packages/slugify/init.py", line 2, in
from slugify.main import Slugify, UniqueSlugify
ImportError: No module named main

[jonafato]

#22 fixes this issue.

[jonafato]

Looks like #22 has been merged, so this issue can be closed.