updated changelog.md - new Relase "v3.1.1" and empty unreleased

CHANGELOG.md

@@ -3,6 +3,15 @@ All notable changes to this project will be documented in this file.
 
 ## [Unreleased]
 ### Added
+
+### Changed
+
+### Fixed
+
+### Removed
+
+## [3.1.1] - 2017-02-06
+### Added
 *added french translation
 *added portuguese translation (not fully translated yet)
 *added turkish translation (not fully translated yet)
@@ -11,11 +20,10 @@ All notable changes to this project will be documented in this file.
 *updated all existing translations (massive improvements in translation)
 
 ### Fixed
-- fix #398: deleting a non-past shift failed hard when trying to gather information about email about to be sent 
+- fix #398: deleting a non-past shift failed hard when trying to gather information about email about to be sent
 
 ### Removed
 
-
 ## [3.1.0] - 2016-10-10
 ### Added
 - [UI] Display a warning when joining overlapping shifts #395