Add Stencila to Who is using Flux in production

README.md

@@ -130,6 +130,7 @@ container images and config changes are propagated to the cluster.
  - [Sage AI Labs](https://www.sage.com)
  - [Sngular](https://www.sngular.com)
  - [Starbucks](https://www.starbucks.com/)
+ - [Stencila](https://stenci.la/)
  - [SupplyStack](https://www.supplystack.com/)
  - [Swoop](https://www.swoopfunding.com)
  - [Talend](https://www.talend.com)
@@ -223,4 +224,4 @@ If you have further questions about Flux or continuous delivery:
   [flux-dev mailing list](https://lists.cncf.io/g/cncf-flux-dev).
 - [File an issue.](https://github.com/fluxcd/flux/issues/new/choose)
 
-Your feedback is always welcome!
+Your feedback is always welcome!