README.md "simple example" link is broken

[Kepler-Br]

Describe the bug
README's "Simple example" link is 404

To Reproduce
Steps to reproduce the behavior:

1. Go to https://github.com/graphql-java-kickstart/graphql-spring-boot#enable-graphql-servlet
2. Click 'simple example' link

Expected behavior
Well, probably this repo should be opened instead?

Desktop:

• Version: commit 9f6e1c54adbe11b21e4ab579b70be31e3b39948f (Master branch as for 24 May 2021)

[setchy]

Thanks @Kepler-Br - broken link has been fixed