Change log for #2350

Author: JonRowe

Changelog.md

@@ -1,10 +1,16 @@
 ### Development
 [Full Changelog](https://github.com/rspec/rspec-rails/compare/v4.0.1...master)
 
+Enhancements:
+
+* Issue a warning when using job matchers with `#at` mis-match on `usec` precision.
+  (Jon Rowe, #2350)
+
 Bug Fixes:
 
 * Indent all extra failure lines output from system specs. (Alex Robbin, #2321)
 * Generated request spec for update now uses the correct let. (Paul Hanyzewski, #2344)
+* Issue warning when imprecise time assertion made
 
 ### 4.0.1 / 2020-05-16
 [Full Changelog](https://github.com/rspec/rspec-rails/compare/v4.0.0...v4.0.1)