upd: ERiC 41.5.4 (#7)

- remove comment for bufa 1138
- update eric version

Author: zembrowski

README.md

@@ -179,7 +179,7 @@ use Rechtlogisch\Steuernummer\Denormalize;
 
 ### Supported tax offices
 
-By default, tax office codes (German: Bundesfinanzamtsnummer - short BUFA) included in the [ELSTER ERiC libraries](https://www.elster.de/elsterweb/infoseite/entwickler) are supported by this package. Currently, based on ERiC 41.2.6. You'll find the list in [src/Bufas.php](./src/Bufas.php).
+By default, tax office codes (German: Bundesfinanzamtsnummer - short BUFA) included in the [ELSTER ERiC libraries](https://www.elster.de/elsterweb/infoseite/entwickler) are supported by this package. Currently, based on ERiC 41.5.4. You'll find the list in [src/Bufas.php](./src/Bufas.php).
 
 The list includes test BUFAs, which are invalid in production. It is recommended to disable them in production with the following environment variable:
 

src/Bufas.php

@@ -6,7 +6,7 @@
 
 class Bufas
 {
-    // list of tax offices supported in ERiC 41.2.6
+    // list of tax offices supported in ERiC 41.5.4
     /**
      * @var array<string, int[]>
      */
@@ -49,7 +49,7 @@ class Bufas
             1135,
             1136,
             1137,
-            1138, // may be used by the end March 2025 on elster.de, and with the next ERiC release (planned for Mai 5th, 2025) cf. https://forum.elster.de/herstellerforum/forum/archiv/elsternewsletter/157669-24-02-2025-aktualisierung-steuernummer-und-identifikationsnummernpr%C3%BCfung @TODO: remove after next ERiC release
+            1138,
         ],
         'BW' => [
             2801,