Added CHANGELOG for #136

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.
 
-## 3.1.1 - TBD
+## 3.1.1 - 2016-07-15
 
 ### Added
 
@@ -18,7 +18,10 @@ All notable changes to this project will be documented in this file, in reverse
 
 ### Fixed
 
-- Nothing.
+- [#136](https://github.com/zendframework/zend-servicemanager/pull/136) removes
+  several imports to classes in subnamespaces within the `ServiceManager`
+  classfile, removing potential name resolution conflicts that occurred in edge
+  cases when testing.
 
 ## 3.1.0 - 2016-06-01