Add ChangeLog entry for #15717

Signed-off-by: William Desportes <williamdes@wdes.fr>

ChangeLog

@@ -10,6 +10,7 @@ phpMyAdmin - ChangeLog
 - issue        Remove extra line break from downloaded blob content
 - issue #15725 Fixed error 500 when exporting - set time limit when $cfg['ExecTimeLimit'] used a string and not an int value
 - issue #15726 Fixed double delete icons on enum editor
+- issue #15717 Fixed warning popup not dissapearing on table stucture when using actions without any column selection
 
 5.0.0 (2019-12-26)
 - issue #13896 Drop support for PHP 5.5, PHP 5.6, PHP 7.0 and HHVM