[changelog] updating changelog with 2.0.0 changes
diff --git a/CHANGELOG.md b/CHANGELOG.md
index afad4d2..db8e857 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,15 +1,46 @@
Changes
=======
+# 2.0.0 / 2018-2-27
+
+### Overview
+This release is a mejor release, there are a some breaking changes. We have
+tried to keep the interface as similar as possible to what the community
+was already used to, but have had to make some changes and cleaned up some
+of the interfaces to some classes. Most notably the main `datadog_agent`
+class, and the `datadog_agent::ubuntu` and `datadog_agent::redhat`.
+
+Most checks manifest should remain backward compatible.
+
+Please note this new release will install datadog agent version 6.x by default.
+
+Finally, deprecated modules and support for EOL'd puppets has been dropped
+so if you're running a puppet server <= `4.5.x` or PE <= `2016.4.x` although
+the module might work for some versions, it has not been tested in those
+environments.
+
+Please read the [docs]() for more details.
+
+### Notes
+
+* [MAJOR] Datadog agent defaults to 6.x. Puppet >=4.6. See #387 and [docs](https://github.com/DataDog/puppet-datadog-agent/blob/master/README.md)
+* [FEATURE] Postgresl: adding SSL parameter support. See #391 (thanks @com6056)
+* [FEATURE] Docker_daemon: parametrize integration. See #378 (thanks @flyinprogrammer)
+* [FEATURE] Kafka: added support for multiple instances. See #343, #395 (thanks @jensendw)
+* [BUGFIX] Tomcat: fix broken metrics yaml. See #390 (thanks @oshmyrko)
+* [BUGFIX] Agent6: fix Agent6 beta fact. See #384 (thanks @scottgeary)
+* [CI] APM: fix APM spec tests. See #389
+* [CI] APM: do not apply footer if empty string. See #381 (thanks @rothgar)
+
# 1.12.1 / 2017-12-29
-### notes
+### Notes
* [BUGFIX] agent6: fix generated YAML. See [#379][]
# 1.12.0 / 2017-12-13
-### notes
+### Notes
* [FEATURE] agent6 beta support. See [#356][]
* [FEATURE] directory integration. See [#357][] (thanks [@alexfouche][])
@@ -288,6 +319,8 @@
# 1.0.1
+[docs]: https://github.com/DataDog/puppet-datadog-agent/blob/master/README.md
+
<!--- The following link definition list is generated by PimpMyChangelog --->
[#79]: https://github.com/DataDog/puppet-datadog-agent/issues/79
[#139]: https://github.com/DataDog/puppet-datadog-agent/issues/139
