Update README.md

Author: alshedivat

README.md

@@ -467,7 +467,7 @@ Before you get started, please take a look at [the guidelines](CONTRIBUTING.md).
 If you would like to improve documentation, add your webpage to the list below, or fix a minor inconsistency or bug, please feel free to send a PR directly to `master`.
 For more complex issues/bugs or feature requests, please open an issue using the appropriate template.
 
-## Core Contributors
+### Core Contributors
 
 <!-- ALL-CONTRIBUTORS-LIST:START - Do not remove or modify this section -->
 <!-- prettier-ignore-start -->