feat: parser now writes, added missing fields

updated docs, example, extensive use of Traits with better handling.
valid level 9 phpstan codebase.

src/Dto/BisCompanyBusinessLine.php

@@ -2,30 +2,27 @@
 
 namespace Ivuorinen\BusinessDataFetcher\Dto;
 
-use Ivuorinen\BusinessDataFetcher\Traits\HasSource;
 use Spatie\DataTransferObject\DataTransferObject;
+use Ivuorinen\BusinessDataFetcher\Traits;
 
 /**
  * Company Business Line
  */
 class BisCompanyBusinessLine extends DataTransferObject
 {
-    use HasSource;
+    use Traits\HasSource;
+    use Traits\HasVersion;
+    use Traits\HasLanguage;
 
     /**
      * Zero for main line of business, positive for others
      */
     public int $order;
 
-    /**
-     * One for current version and >1 for historical lines of business
-     */
-    public int $version;
-
     /**
      * Date of registration
      */
-    public string $registrationDate = "";
+    public string $registrationDate = '';
 
     /**
      * Ending date of registration
@@ -35,10 +32,5 @@ class BisCompanyBusinessLine extends DataTransferObject
     /**
      * Name of line of business
      */
-    public string $name = "";
-
-    /**
-     * Two letter language code
-     */
-    public ?string $language = null;
+    public string $name = '';
 }