Update core contributors (#1697)

* Update core contributors

We should acknowledge the current active maintainers of this project, and the work they do for it, while also respecting the space (while acknowledging our gratitude) of those who are no longer contributing so actively.

* add worsd

Author: keithamus

README.md

@@ -147,8 +147,16 @@ list of contributors.
 Feel free to reach out to any of the core contributors with your questions or
 concerns. We will do our best to respond in a timely manner.
 
+[![Keith Cirkel](https://avatars3.githubusercontent.com/u/118266?v=3&s=50)](https://github.com/keithamus)
+[![James Garbutt](https://avatars3.githubusercontent.com/u/5677153?v=3&s=50)](https://github.com/43081j)
+[![Kristján Oddsson](https://avatars3.githubusercontent.com/u/318208?v=3&s=50)](https://github.com/koddsson)
+
+### Core Contributor Alumni
+
+This project would not be what it is without the contributions from our prior
+core contributors, for whom we are forever grateful:
+
 [![Jake Luer](https://avatars3.githubusercontent.com/u/58988?v=3&s=50)](https://github.com/logicalparadox)
 [![Veselin Todorov](https://avatars3.githubusercontent.com/u/330048?v=3&s=50)](https://github.com/vesln)
-[![Keith Cirkel](https://avatars3.githubusercontent.com/u/118266?v=3&s=50)](https://github.com/keithamus)
 [![Lucas Fernandes da Costa](https://avatars3.githubusercontent.com/u/6868147?v=3&s=50)](https://github.com/lucasfcosta)
 [![Grant Snodgrass](https://avatars3.githubusercontent.com/u/17260989?v=3&s=50)](https://github.com/meeber)