fix: Include type file in npm package (#814)

Author: eKoopmans

package.json

@@ -6,7 +6,8 @@
   "types": "./type.d.ts",
   "files": [
     "/src",
-    "/dist"
+    "/dist",
+    "./type.d.ts"
   ],
   "repository": "[email protected]:eKoopmans/html2pdf.js.git",
   "keywords": [