Update src/PhpWord/PhpWord.php

As suggested

Co-authored-by: Progi1984 <[email protected]>

Author: Collie-IT

src/PhpWord/PhpWord.php

@@ -261,7 +261,7 @@ public function setDefaultFontName($fontName): void
      *
      * @param string $fontColor
      */
-    public function setDefaultFontColor($fontColor): void
+    public function setDefaultFontColor(string $fontColor): void
     {
         Settings::setDefaultFontColor($fontColor);
     }