Updated changelog (0.12)

CHANGELOG.md

@@ -1,5 +1,20 @@
 # InSTEDD Surveda Changelog
 
+## Larch 0.12
+
+There is a new endpoint to collect metrics by Prometheus. This endpoint can be protected with username and password using the environment variables METRICS_USER (defaults to "metrics") and METRICS_PASS.
+
+In order to use Guisso for authentication and SSO, some new environment variables must be set:
+  * GUISSO_ENABLED: boolean, defaults to `false`
+  * GUISSO_BASE_URL: the base url of the Guisso server (ie: `https://login.instedd.org`)
+  * GUISSO_CLIENT_ID and GUISSO_CLIENT_SECRET: credentials generated in Guisso for the Surveda application
+
+### Features
+
+* Integrated Prometheus endpoint to export HTTP metrics [#1115](https://github.com/instedd/ask/issues/1115)
+* Single sign-on using Guisso [#1144](https://github.com/instedd/ask/issues/1144)
+* OAuth2 authentication for APIs [#1145](https://github.com/instedd/ask/issues/1145)
+
 ## Katsura 0.11
 
 In this release the development platform was updated (Elixir 1.5, Phoenix 1.3, Ecto 2.1.6)