Add a changelog entry for rspec#1499

[ci skip]

Author: Sam Phippen

Changelog.md

@@ -1,3 +1,11 @@
+### 3.4.1 Development
+[Full Changelog](http://github.com/rspec/rspec-rails/compare/v3.4.0...master)
+
+Bug fixes:
+
+* Make it possible to write nested specs within helper specs on classes that are
+  internal to helper classes. (Sam Phippen, Peter Swan, #1499).
+
 ### 3.4.0 / 2015-11-11
 [Full Changelog](http://github.com/rspec/rspec-rails/compare/v3.3.3...v3.4.0)