Update README.md

Author: PovilasKorop

README.md

@@ -31,7 +31,7 @@ Invoice file can be stored, downloaded, streamed on any of the filesystems you h
 Via Composer
 
 ```bash
-$ composer require laraveldaily/laravel-invoices:^4.0
+$ composer require laraveldaily/laravel-invoices:^4.1
 ```
 
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