existence check fails in IE 11

[Paul R.]

Hey,

first of all nice component!
Since we need to support IE11, I tested your component there. Problem ist, that your check, if the browser supports Notification fails in IE11. (https://github.com/leejaen/React-Desktop-Notification/blob/master/index.js#L16)

A working way is
if ('Notification' in window) { // API is supported }

Sadly I have to wrap your Component-Call in this if-case.
Could you please use the check I provide?

[Paul R.]

@leejaen thx for accepting the PR. will there be the new version soon? :)

[Li Zhen]

@Waize Sure, the last version 1.0.9 already on npm: https://www.npmjs.com/package/react-desktop-notification .