Update README.md

Author: udaycodespace

README.md

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-```txt
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  ██████╗██████╗ ███████╗██████╗ ██╗███████╗██╗   ██╗
 ██╔════╝██╔══██╗██╔════╝██╔══██╗██║██╔════╝╚██╗ ██╔╝
 ██║     ██████╔╝█████╗  ██║  ██║██║█████╗   ╚████╔╝
 ██║     ██╔══██╗██╔══╝  ██║  ██║██║██╔══╝    ╚██╔╝
 ╚██████╗██║  ██║███████╗██████╔╝██║██║        ██║
  ╚═════╝╚═╝  ╚═╝╚══════╝╚═════╝ ╚═╝╚═╝        ╚═╝
-```
+</pre>
 
 ### Permissioned Private Blockchain for Academic Credential Verification
 
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