[no ci] Update README.md (#508)

README.md

@@ -34,7 +34,9 @@ This library supports generating and decoding [JSON Web Tokens](https://tools.ie
 
 ## Sponsor
 
-[Sponsor wanted](https://github.com/sponsors/abatishchev) or just [buy me a coffee](https://buymeacoffee.com/abatishchev). Thanks!
+| | |
+|-|-|
+| [<img alt="Auth0 logo" src="https://cdn.auth0.com/blog/github-sponsorships/brand-evolution-logo-Auth0-horizontal-Indigo.png" height="91">](https://a0.to/try-auth0) | If you want to quickly implement a secure authentication to your JWT project, [create an Auth0 account](https://a0.to/try-auth0); it's Free! |
 
 ## Avaliable NuGet packages