Add references to new infrastructure providers

Closes #16

Author: kraai

README.md

@@ -47,4 +47,7 @@ Haskell.org uses many service providers for its infrastructure.
 * [CloudFlare](https://www.cloudflare.com/) provides DNS management, Anti-DDoS, and high-grade frontend SSL and caching for most of Haskell.org
 * Status.io powers https://status.haskell.org, and lets us easily tell you when we broke something.
 * [DreamHost](https://www.dreamhost.com/) supports Haskell.org by providing free and unlimited object storage and bandwidth via DreamObjects, which we use to stash logs, perform backups, and generally host all kinds of long-term content that we might need.
-
+* [SimSpace](https://simspace.com/) hosts some of the GHC CI infrastructure for ARM.
+* [Discourse](https://www.discourse.org/) hosts <https://discourse.haskell.org/>.
+* [DigitalOcean](https://www.digitalocean.com/)
+* [OpenCape](https://www.opencape.org/)