Docs for version 5.0.0

Author: JonRowe

Changelog.md

@@ -1,9 +1,15 @@
-### Development
+### 5.0.0
 [Full Changelog](https://github.com/rspec/rspec-rails/compare/v4.1.0...main)
 
+Enhancements:
+
 * Support new #file_fixture_path and new fixture test support code. (Jon Rowe, #2398)
 * Support for Rails 6.1. (Benoit Tigeot, Jon Rowe, Phil Pirozhkov, and more #2398)
 
+Breaking Changes:
+
+* Drop support for Rails below 5.2.
+
 ### 4.1.0 / 2021-03-06
 
 Enhancements:

features/upgrade/README.md

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+# Upgrading from rspec-rails 4.x to version 5
+
+RSpec Rails 5 is a major version under semantic versioning, it also follows our new versioning strategy for RSpec-Rails, which is to keep in step with Rails supported versions. Thus it supports 5.2, 6.0 and 6.1. There are no changes required to upgrade to RSpec Rails 5 if you are using a supported version of Rails.
+
+If you are using an older version of Rails, you can use 4.x which hard supports 5.0 and 5.1, and soft supports 4.2 (which is unmaintained).
+
 # Upgrading from rspec-rails 3.x to version 4
 
 RSpec Rails 4 is a major version under semantic versioning, it allowed us to change the supported Rails versions to 5 and 6 only. There are no changes required to upgrade to RSpec Rails 4 if you are using Rails 5 or 6.