Update README.md

hwding · Aug 21, 2017 · 69109bf · 69109bf
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 # pdf-unstamper
 Text stamp remover for PDF files.
 
+Powered by [Apache PDFBox®](https://pdfbox.apache.org/)
+
 ## Run
 ```
 ➜ java -jar pdf-unstamper.jar [ARGUMENTS]...