Install psalm as dev, sync scripts updates

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

@@ -0,0 +1,24 @@
+<?php
+
+namespace LanguageServerProtocol;
+
+/**
+ * A document highlight kind.
+ */
+abstract class DocumentHighlightKind
+{
+    /**
+     * A textual occurrence.
+     */
+    const TEXT = 1;
+
+    /**
+     * Read-access of a symbol, like reading a variable.
+     */
+    const READ = 2;
+
+    /**
+     * Write-access of a symbol, like writing to a variable.
+     */
+    const WRITE = 3;
+}