Don't be lazy on Windows

[hynek]

Fixes #232

Could you check if this helps @wimglenn?

I've decided to go the grossest possible route: non-lazy on Windows, lazy everywhere else…

cc @MarkusH

[MarkusH]

I don't have a Windows at hand right now. I can check the next days :)

[wimglenn]

@hynek I wasn't able to install your package on windows, something in the regex must be platform dependent (perhaps it's due to hardcoded \n endings in this pattern - the changelog text will have \r\n the way you've defined the read function, so the pattern doesn't match anything)

C:\...\structlog> python setup.py
Traceback (most recent call last):
  File "setup.py", line 100, in <module>
    + re.search(
AttributeError: 'NoneType' object has no attribute 'group'

However, I can confirm the fix works on Windows. I was able to test this just by cd into the ./src directory and checking out the lazy-win-hack branch.

No shame in the "gross" route for windows - a dumb conditional is also how I deal with colorama init for cross-platform.