5.2.0-rc.2

In this latest release candidate, we've addressed several issues found in RC 1.

• ng add now installs dependencies required for the schematic, ng deploy, and functionality of AngularFire. This allowed us to move all the new dependencies to peers, reducing the chance of version conflicts.
• ng add is now more permissive in the format of existing .firebaserc and firebase.json files
• All the packages indicate their side effects
• Dropped the peer requirements on Angular 8.0-rcs now that they're stable