Removed AWS sponsor since they stopped

Author: EdwardCooke

README.md

@@ -140,7 +140,3 @@ Please read [CONTRIBUTING.md](CONTRIBUTING.md) for guidelines.
 
 Please see the Releases at https://github.com/aaubry/YamlDotNet/releases
 
-## Sponsorships
-A big shout out to all of our sponsors
-
-[![AWS](Sponsors/aws-logo-small.png)](https://www.github.com/aws)