Fix CS

Author: renanbr

src/Exception/CurrencyMismatchException.php

@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Money\Exception;
 
 final class CurrencyMismatchException extends InvalidArgumentException

src/Exception/DivisionByZeroException.php

@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Money\Exception;
 
 final class DivisionByZeroException extends InvalidArgumentException

src/Exception/ModuloByZeroException.php

@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Money\Exception;
 
 final class ModuloByZeroException extends InvalidArgumentException