upgrade to laravel 7 and set branch to v2

vendor/vlucas/phpdotenv/src/Repository/Adapter/ArrayAdapter.php

@@ -0,0 +1,67 @@
+<?php
+
+namespace Dotenv\Repository\Adapter;
+
+use PhpOption\None;
+use PhpOption\Some;
+
+class ArrayAdapter implements AvailabilityInterface, ReaderInterface, WriterInterface
+{
+    /**
+     * The variables and their values.
+     *
+     * @var array<string,string|null>
+     */
+    private $variables = [];
+
+    /**
+     * Determines if the adapter is supported.
+     *
+     * @return bool
+     */
+    public function isSupported()
+    {
+        return true;
+    }
+
+    /**
+     * Get an environment variable, if it exists.
+     *
+     * @param string $name
+     *
+     * @return \PhpOption\Option<string|null>
+     */
+    public function get($name)
+    {
+        if (array_key_exists($name, $this->variables)) {
+            return Some::create($this->variables[$name]);
+        }
+
+        return None::create();
+    }
+
+    /**
+     * Set an environment variable.
+     *
+     * @param string      $name
+     * @param string|null $value
+     *
+     * @return void
+     */
+    public function set($name, $value = null)
+    {
+        $this->variables[$name] = $value;
+    }
+
+    /**
+     * Clear an environment variable.
+     *
+     * @param string $name
+     *
+     * @return void
+     */
+    public function clear($name)
+    {
+        unset($this->variables[$name]);
+    }
+}