Update README.md

Author: yushulx

README.md

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 - [![](https://img.shields.io/badge/Download-Offline%20SDK-orange)](https://www.dynamsoft.com/barcode-reader/downloads)
 - [![](https://img.shields.io/badge/Get-30--day%20FREE%20Trial%20License-blue)](https://www.dynamsoft.com/customer/license/trialLicense/?product=dbr)
 
-## What You Should Know
-- [![](https://img.shields.io/badge/Get-30--day%20FREE%20Trial%20License-blue)](https://www.dynamsoft.com/customer/license/trialLicense/?product=dbr)
-
 **[Dynamsoft's Barcode Reader SDK](https://www.dynamsoft.com/barcode-reader/overview/?utm_source=github) enables you to efficiently embed barcode reading functionality in your web, desktop or mobile application using just a few lines of code. Saving you months of added development time and resources, our SDK can create high-speed and reliable barcode scanner software applications to meet your business needs.**
 
 ## Dynamsoft Barcode Reader - Python Edition