Update README.md

README.md

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 This repository hosts the oneM2M TR-0025 specification defined by oneM2M Partnership project.
 
-[`  Generate Document  `](http://www.google.com)
+[`  Generate Document  `](https://www.google.com)
 
+<a href="https://www.google.com" target="_blank">`  Generate Document (new window)  `</a>
 
 ## Available versions