Update readme file

README.md

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-## Biztrx - Business theme (Premium)
+## Biztrox - Business theme (Premium)
 [![Biztrox hugo theme](https://user-images.githubusercontent.com/5304905/48638129-e8ffb200-e9f9-11e8-99a7-b081e27a1941.png)](https://themefisher.com/products/biztrox-hugo-template/)
 
 [Live Preview](http://demo.themefisher.com/themefisher/biztrox-hugo/)