Engine Yard Platform Release Notes for May 25, 2020

Action: None. The changes take place upon deployment of the Engine Yard backend.

• Fix: EY Single-Sign-On failures 
• Feature: Offer Rails 6 as a Web Application Framework 
• Fix: 5th Gen instances are not supported by Engine Yard RDS 
• Feature: Implement CoreAPI delete method for Environment Variables 
• Fix: Update list of valid regions for EFS shared filesystems
• Fix: Old firewall records are not deleted on environment deletion 
• Fix: Delete old Security Group and firewall records when environment's network is changed