feat: update PHPUnit commands in composer.json and improve update instructions format

.vscode/ftp-kr.json

@@ -15,4 +15,4 @@
     ".svn",
     "/.vscode"
   ]
-}
+}

UPDATE_INSTRUCTIONS.md

@@ -48,7 +48,7 @@ rm -rf temp/temp_XXX
 ### 6. Zaktualizuj changelog.php
 Dodaj wpis na początku pliku:
 ```html
-<b>ver. X.XXX</b><br />
+<b>ver. X.XXX - DD.MM.YYYY</b><br />
 - NEW/FIX/UPDATE - opis zmiany
 <hr>
 ```

composer.json

@@ -22,7 +22,8 @@
         }
     },
     "scripts": {
-        "test": "phpunit",
-        "test-coverage": "phpunit --coverage-html coverage"
+        "test": "C:\\xampp\\php\\php.exe phpunit.phar --do-not-cache-result",
+        "test-articles": "C:\\xampp\\php\\php.exe phpunit.phar --do-not-cache-result tests/Unit/admin/Controllers/ArticlesControllerTest.php",
+        "test-coverage": "C:\\xampp\\php\\php.exe phpunit.phar --coverage-html coverage"
     }
 }