chore: fix npm release

Author: MathiasVDA

package.json

@@ -4,6 +4,11 @@
   "version": "0.1.0",
   "description": "YASGUI plugin for visualizing SPARQL CONSTRUCT and DESCRIBE query results as interactive graphs",
   "main": "dist/yasgui-graph-plugin.min.js",
+  "files": [
+    "dist",
+    "README.md",
+    "LICENSE"
+  ],
   "scripts": {
     "dev": "vite",
     "build:demo": "vite build demo",