README.md in petrarca-0.5.9 vs README.md in petrarca-0.5.10

@@ -10,10 +10,10 @@
 All functions support both ISBN-13 and ISBN-10.
 
 All ranges of registration groups and registrants are supported.
 Those depends on 'RangeMessage.xml' file, downloaded from [International ISBN Agency](https://www.isbn-international.org/range_file_generation).
 
-NOTE: Updated range files to latest version on March 4, 2023.
+NOTE: Updated range files to latest version on April 9, 2023.
 
 ## Installation
 
 Add this line to your application's Gemfile: