Chg: update Changelog with 1.2.0 release date

pictavien · pictavien · commit 097df63b1137 · 2020-02-12T16:03:02.000+01:00
diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -6,7 +6,7 @@ This file lists modifications introduced by each version.
 
 * Empty
 
-## [1.2.0] - todo
+## [1.2.0] - 2020/02/12
 
 ###  ClockManager class modifications
 
