fix(core): update

ts/smartpdf.plugins.ts

@@ -15,6 +15,8 @@ export { smartfile, smartpromise, smartpuppeteer, smartunique, smartnetwork };
 
 // thirdparty
 import pdfMerger from 'pdf-merger-js';
+// @ts-ignore
+import pdf2json from 'pdf2json';
 import express from 'express';
 
-export { pdfMerger, express };
+export { pdfMerger, pdf2json, express };