Updated readme

README.md

@@ -82,6 +82,7 @@ CII to UBL Converter for EN 16931 invoices
 
 * v1.4.8 - work in progress
     * Added new option `--output-suffix` to customize the output file suffix, that is currently hard coded to `-ubl`
+    * Fixed a problem with the mapping of BT-147, BT-148, BT-149 and BT-150. See [issue #15](https://github.com/phax/en16931-cii2ubl/issues/15). Thanks to @cambid for pointing that out
 * v1.4.7 - 2022-02-15
     * Further improved `null`/empty handling to avoid creation of empty elements
 * v1.4.6 - 2022-02-12