Fix iOS code error

Merge pull request #64 from koji-1009/2.2.2

2.2.2

Support Email link auth on iOS

Thanks @vlad-litvinenko! (#59)

Update firebase_core 1.3.0

• firebase_auth 1.4.1
• FirebaseUI-Android 7.2.0
• FirebaseUI-iOS 11.0.3

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Fix EmailLink on iOS (#58).
Thanks @vlad-litvinenko!

Rename `AuthUiProvider` from `AuthUiItem`

2.1.0

2.1.0

Use effective_dart style

2.0.2+1

2.0.2+1

Update firebase_auth

• firebase_auth ^1.0.3

Support Logo in FirebaseUI-Android

• firebase_auth 1.0.1

Null Safety

• null safety
• support web

Enhance web support

• Change EmailAuth option
• Delete iOS option class
• Update README

Fix pubspec.yaml

Fix pubspec.yaml.