Update changelog for 2.7.6

cyderize · cyderize · commit 3202c5729899 · 2023-06-20T14:35:27.000+10:00
diff --git a/MiniZincIDE/CHANGES b/MiniZincIDE/CHANGES
@@ -1,3 +1,7 @@
+2023-05-20
+  v2.7.6
+-  Update to MiniZinc 2.7.6.
+
 2023-06-07
   v2.7.5
 -  Use native Qt dark mode on Windows where supported.
