[no ci] Update README.md with sponsor information (#499)

* Update README.md with sponsor information

Author: abatishchev

README.md

@@ -1,5 +1,6 @@
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 - [Jwt.Net, a JWT (JSON Web Token) implementation for .NET](#jwtnet-a-jwt-json-web-token-implementation-for-net)
 - [Sponsor](#sponsor)
 - [Avaliable NuGet packages](#avaliable-nuget-packages)
@@ -33,9 +34,7 @@ This library supports generating and decoding [JSON Web Tokens](https://tools.ie
 
 ## Sponsor
 
-| | |
-|-|-|
-| [<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! |
+[Sponsor wanted](https://github.com/sponsors/abatishchev) or just [buy me a coffee](https://buymeacoffee.com/abatishchev). Thanks!
 
 ## Avaliable NuGet packages