New: Sign in with Custom String!

Can be useful when a Firebase Auth system that you want doesn't exist.  For example:

• Google Play Games Authentication (using myID as a custom unique string) 
• Game Center Authentication using (using PlayerID as your custom unique string)  
• Web 3.0 Authentication (using Wallet address as your custom unique string)  

Check out the full release notes: 

https://www.constructfirebase.com/releases/release-notes