Changelog for #1550
Update changelog for v2.99.0 [ci skip]
Release 2.99.0
Deprecation warning when RSpec.run is programmatically invoked twice.

This is because RSpec.reset is no longer called for users as of RSpec
3.0.0 so this deprecation warning will indicate to them that the need to
invoke the method themselves.
Add a changelog entry for 1579
Print the warning to the deprecation stream
Only print the reset deprecation on runs after the first
Simplify warning/tests for reset deprecation
Add a full changelog entry for #1587.