Adds CHANGELOG entry for #349

Author: weierophinney

CHANGELOG.md

@@ -2,7 +2,7 @@
 
 All notable changes to this project will be documented in this file, in reverse chronological order by release.
 
-## 2.1.1 - TBD
+## 2.1.1 - 2019-01-05
 
 ### Added
 
@@ -22,7 +22,7 @@ All notable changes to this project will be documented in this file, in reverse
 
 ### Fixed
 
-- Nothing.
+- [#349](https://github.com/zendframework/zend-diactoros/pull/349) fixes an issue when marshaling headers with values of `0` or `0` from the SAPI, ensuring they are detected and injected into the ServerRequest properly.
 
 ## 2.1.0 - 2018-12-20