Install psalm as dev, sync scripts updates

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

@@ -0,0 +1,22 @@
+<?php
+
+namespace LanguageServerProtocol;
+
+class SelectionRangeClientCapabilities
+{
+
+    /**
+     * Whether implementation supports dynamic registration for selection range
+     * providers. If this is set to `true` the client supports the new
+     * `SelectionRangeRegistrationOptions` return value for the corresponding
+     * server capability as well.
+     *
+     * @var bool|null
+     */
+    public $dynamicRegistration;
+
+    public function __construct(bool $dynamicRegistration = null)
+    {
+        $this->dynamicRegistration = $dynamicRegistration;
+    }
+}