upgrade to laravel 7 and set branch to v2

vendor/brick/math/src/Exception/NegativeNumberException.php

@@ -0,0 +1,12 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Brick\Math\Exception;
+
+/**
+ * Exception thrown when attempting to perform an unsupported operation, such as a square root, on a negative number.
+ */
+class NegativeNumberException extends MathException
+{
+}