Update README.MD

README.MD

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 # SingleFile
-SingleFile is a Web Extension compatible with Chrome, Firefox (Desktop and Mobile), Opera, and Edge that helps you to save a complete web page into a single HTML file.
+SingleFile is a WebExtension compatible with Chrome, Firefox (Desktop and Mobile), Opera, and Edge that helps you to save a complete web page into a single HTML file.
 
 ## Demo
 https://www.youtube.com/watch?v=RdV8DBW5b0g