Merge branch 'mr/fofanov/gnatkp-version' into 'master'

Change version string in GNATKP mode.

See merge request eng/libadalang/langkit-query-language!330

Author: t-14

lkql_checker/src/gnatcheck-output.adb

@@ -320,8 +320,11 @@ package body Gnatcheck.Output is
 
    procedure Print_Tool_Version (Released_At : Positive) is
    begin
-      Put ("GNATCHECK ");
-      Put (Version_String);
+      if Gnatkp_Mode then
+         Put ("GNATKP " & Date);
+      else
+         Put ("GNATCHECK " & Version_String);
+      end if;
       New_Line;
 
       Put ("Copyright (C) ");