Update changelog for #2669

Author: JonRowe

Changelog.md

@@ -1,3 +1,11 @@
+### Development
+[Full Changelog](http://github.com/rspec/rspec-core/compare/v3.9.0...master)
+
+Bug Fixes:
+
+* Prevent bisect command from blocking when number of specs exceeds file
+  descriptor limit on OSX or Linux. (Benoit Tigeot, #2669)
+
 ### 3.9.0 / 2019-10-07
 [Full Changelog](http://github.com/rspec/rspec-core/compare/v3.8.2...v3.9.0)