fix CHANGELOG date

Signed-off-by: Victor Vieux <victorvieux@gmail.com>

CHANGELOG.md

@@ -5,7 +5,7 @@ information on the list of deprecated flags and APIs please have a look at
 https://docs.docker.com/engine/deprecated/ where target removal dates can also
 be found.
 
-## 17.03.0-ce (2017-02-01)
+## 17.03.0-ce (2017-03-01)
 
 ### Client