Install psalm as dev, sync scripts updates

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

@@ -0,0 +1,19 @@
+<?php
+
+namespace LanguageServerProtocol;
+
+class VersionedTextDocumentIdentifier extends TextDocumentIdentifier
+{
+    /**
+     * The version number of this document.
+     *
+     * @var int
+     */
+    public $version;
+
+    public function __construct(string $uri = null, int $version = null)
+    {
+        parent::__construct($uri);
+        $this->version = $version;
+    }
+}