Readme.md - add windows passing and linux passing to CI badges.

[shakyShane]

Given that this lib has gone to great efforts to ensure full support for both Windows + Unix-like systems, I believe that it should be clearer to users that this is the case.

Unless they are using app veyor themselves, the vast majority of your users will be none the wiser in regards to OS support as the app veyor logo will mean nothing to them.

This change is a simple one, but will make it crystal clear to all users that you take Windows support seriously.

Preview:

http://f.cl.ly/items/2U151G0q3q2H0B3v253n/Screen%20Shot%202015-03-22%20at%2015.58.41.png

[es128]

Thanks for the PR and the supportive comments. For this lib, Mac is actually a totally distinct case from Linux as well. Any idea how to distinguish between them from the Travis tests for separate badges on those?

[shakyShane]

Badges on travis are per-build - so you couldn't have separate badges.

Nothing stopping something like ...

... though :)

[shakyShane]

or even this looks nicer I think

https://img.shields.io/travis/paulmillr/chokidar/master.svg?label=Mac%20OSX%20%26%20Linux

[shakyShane]

Updated, preview https://github.com/shakyShane/chokidar

[es128]

Yup, looks great. Thanks.

[shakyShane]

👍 - thanks to you for the great lib - I'm in the process of using it to replace Gaze in BrowserSync :)

[es128]

Cool. Let me know when that's published and we can mention it in the chokidar readme.

[shakyShane]

Will do, reliant on #264 however.