Add channel name in documentation

[LazzeZee]

When adding notification channel there should be a channel name to avoid IllegalArgumentException:

var channel  = {
    name: "my_channel_name,
    id: "my_channel_id",
    sound: "mysound",
    vibration: true,
    light: true,
    lightColor: parseInt("FF0000FF", 16).toString(),
    importance: 4,
    badge: true,
    visibility: 1
};

FirebasePlugin.createChannel(channel,
function(){
    console.log('Channel created: ' + channel.id);
},
function(error){
   console.log('Create channel error: ' + error);
});

[evangunawan]

This occurs to me too, waste some time to find it. It is right that the name is mandatory.

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[dpa99c]

Reopening as stalebot incorrectly closed it

[DioxideHydrogen]

This happening with me too. I get the example on README and only modify the sound name.

[DioxideHydrogen]

So, come back here, i discover that for some reason that i dont know why, in emulator i can't create the channel, why when i runed the cordova project in my phone, the chanel was properly created. This must be a dependecy (idk) that by default is not installed in emulator.