upgrade to laravel 7 and set branch to v2

vendor/phpunit/php-code-coverage/src/Version.php

@@ -1,4 +1,4 @@
-<?php
+<?php declare(strict_types=1);
 /*
  * This file is part of the php-code-coverage package.
  *
@@ -21,7 +21,7 @@ final class Version
     public static function id(): string
     {
         if (self::$version === null) {
-            $version       = new VersionId('6.1.4', \dirname(__DIR__));
+            $version       = new VersionId('7.0.14', \dirname(__DIR__));
             self::$version = $version->getVersion();
         }