Merge pull request #13 from hsoberon/bugfix/psalm-direct-string-cast

Fix a ImplicitToStringCast of string currency

src/Utility/MoneyUtil.php

@@ -116,7 +116,7 @@ protected static function loadMoneyFormatter(Currency $currency): MoneyFormatter
             throw new RuntimeException(
                 sprintf(
                     'Cannot format currency \'%s\'. Only ISO currencies and Bitcoin are allowed.',
-                    $currency
+                    (string) $currency
                 )
             );
         }