Update README.md

Andrey Safonov · web-flow · commit f4671e523ad7 · 2020-04-12T10:43:58.000-07:00
diff --git a/README.md b/README.md
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 ## nodejs-convert-file-server
 Node.js - Convert from MS Office, images to PDF, get thumbnails for file previews, optimize files for quick rendering.
 
+Uses Node.js, Express.js and PDFTron Node.js SDK.
+
 ### Installation
 
 Clone the repo and run
