Install psalm as dev, sync scripts updates

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

@@ -0,0 +1,33 @@
+<?php
+
+namespace LanguageServerProtocol;
+
+/**
+ * Completion options.
+ */
+class CompletionOptions
+{
+    /**
+     * The server provides support to resolve additional information for a completion
+     * item.
+     *
+     * @var bool|null
+     */
+    public $resolveProvider;
+
+    /**
+     * The characters that trigger completion automatically.
+     *
+     * @var string[]|null
+     */
+    public $triggerCharacters;
+
+    /**
+     * @param string[]|null $triggerCharacters
+     */
+    public function __construct(bool $resolveProvider = null, array $triggerCharacters = null)
+    {
+        $this->resolveProvider = $resolveProvider;
+        $this->triggerCharacters = $triggerCharacters;
+    }
+}