Changelog for #2037

Author: JonRowe

Changelog.md

@@ -1,7 +1,12 @@
 ### Development
 [Full Changelog](http://github.com/rspec/rspec-rails/compare/v3.8.1...master)
 
-### Development
+Bug Fixes:
+
+* Fix issue with generator for preview specs where `Mailer` would be duplicated
+  in the name. (Kohei Sugi, #2037)
+
+### 3.8.1 / 2018-10-23
 [Full Changelog](http://github.com/rspec/rspec-rails/compare/v3.8.0...v3.8.1)
 
 Bug Fixes: