Corrected dates in changelog

changelog

@@ -9,7 +9,7 @@
     - improvements in tests;
     - optimization of displaying file list with categories.
 
-* Fri Dec 7 2019 Eugene 'Vindex' Stulin <tech.vindex@gmail.com> 0.12
+* Sat Dec 7 2019 Eugene 'Vindex' Stulin <tech.vindex@gmail.com> 0.12
     - categories are combined when creating an alias with
       an existing category name;
     - HTML-page saves with command line option '--save' only
@@ -28,7 +28,7 @@
 * Tue Oct 1 2019 Eugene 'Vindex' Stulin <tech.vindex@gmail.com> 0.10.3
     - fixed a bug that could occur when renaming a category.
 
-* Sun Aug 24 2019 Eugene 'Vindex' Stulin <tech.vindex@gmail.com> 0.10.2
+* Sat Aug 24 2019 Eugene 'Vindex' Stulin <tech.vindex@gmail.com> 0.10.2
     - case sensitivity fixed (used to work with the opposite logic);
     - error of opening empty file list corrected
       (for example, 'vitis open Thing \\ Thing');