Change log for rspec#2058

Author: JonRowe

Changelog.md

@@ -6,6 +6,8 @@ Bug Fixes:
 * Fix issue with generator for preview specs where `Mailer` would be duplicated
   in the name. (Kohei Sugi, #2037)
 * Fix the request spec generator to handle namespaced files. (Kohei Sugi, #2057)
+* Further truncate system test filenames to handle cases when extra words are
+  prepended. (Takumi Kaji, #2058)
 
 ### 3.8.1 / 2018-10-23
 [Full Changelog](http://github.com/rspec/rspec-rails/compare/v3.8.0...v3.8.1)