Added support for running in the browser

[DoryZi]

Hi,

Great project! I've started to use it.
However the missing browser module, wasn't super trivial so I created a browser port of this swagger npm module.
Here it is:
https://github.com/CoreTeamIO/js-browser-flagr

would be cool to be included in your readme, if that makes sense to you.
I just want to help people use this easily.

Cheers
D.

[zhouzhuojie]

Thanks for the browser port! I created an issue openflagr/flagr#378 to track in general how to improve the documentation around flagr clients. Will mention it on the future documentation of flagr.