Install psalm as dev, sync scripts updates

vendor/felixfbecker/language-server-protocol/src/ClientInfo.php

@@ -0,0 +1,29 @@
+<?php
+
+namespace LanguageServerProtocol;
+
+class ClientInfo
+{
+    /**
+     * The name of the client as defined by the client.
+     *
+     * @var string
+     */
+    public $name;
+
+    /**
+     * The client's version as defined by the client.
+     *
+     * @var string|null
+     */
+    public $version;
+
+    public function __construct(
+        string $name = null,
+        string $version = null
+    ) {
+        /** @psalm-suppress PossiblyNullPropertyAssignmentValue */
+        $this->name = $name;
+        $this->version = $version;
+    }
+}