wiki: add Hachyderm validation link to index page.

Change-Id: I0831d9be7c269a2125d7d0c3ca4232e24e40da4a
Reviewed-on: https://go-review.googlesource.com/c/wiki/+/552755
Commit-Queue: David Chase <drchase@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
Run-TryBot: David Chase <drchase@google.com>
Reviewed-by: David Chase <drchase@google.com>
diff --git a/index.md b/index.md
index 9be475b..0f68310 100644
--- a/index.md
+++ b/index.md
@@ -103,6 +103,7 @@
   - [Gophers Slack Channel](http://gophers.slack.com/) - For real-time chat ([request membership](http://blog.gopheracademy.com/gophers-slack-community/)).
   - [Golang News](http://golangnews.com) - For curated links about Go Programming.
   - There is also a [/r/golang](http://reddit.com/r/golang) sub-reddit.
+  - On Mastodon, follow the <!--- By-hand link for Hachyderm.io account verification. ---><a rel="me noreferrer" href="https://hachyderm.io/@golang" target="_blank">@golang</a> account and keep tabs on the #golang hashtag.
   - On Twitter, follow the [@golang](https://twitter.com/golang) account and keep tabs on the [#golang](https://twitter.com/search?q=%23golang&src=typd) hashtag.
   - We've also got a landing page on [Stack Overflow](http://stackoverflow.com/tags/go) for Go Q&A.
   - Matrix enthusiasts are invited to join [#Go:matrix.org](https://riot.im/app/#/room/#Go:matrix.org).