Update src/PhpWord/PhpWord.php

As suggested

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

Author: Collie-IT

src/PhpWord/PhpWord.php

@@ -271,7 +271,7 @@ public function setDefaultFontColor(string $fontColor): void
      *
      * @return string
      */
-    public function getDefaultFontColor()
+    public function getDefaultFontColor(): string
     {
         return Settings::getDefaultFontColor();
     }