[iOS] Update Firebase SDK to v6.11.0 released 22 Oct 2019 https://firebase.google.com/support/release-notes/ios#version_6110_-_october_22_2019
[iOS] Update Firebase SDK to v6.11.0 released 22 Oct 2019
https://firebase.google.com/support/release-notes/ios#version_6110_-_october_22_2019

DigitalsunrayMedia/cordova-plugin-firebase,DigitalsunrayMedia/cordova-plugin-firebase,DigitalsunrayMedia/cordova-plugin-firebase