Update changelog for 2.0.0

CHANGELOG.md

@@ -1,10 +1,28 @@
+## 2.0.0 (2023-08-14)
+
+**ATTENTION:** This major release removes support for Graylog versions < 5.0
+and switches the `graylog::allinone` module from Elasticsearch to OpenSearch.
+
+- Add `java_opts` config option to configure addition Java options. ([#52](https://github.com/Graylog2/puppet-graylog/pull/52), @timdeluxe)
+- Add stdlib 9.x compatibility. ([#59](https://github.com/Graylog2/puppet-graylog/pull/59), @cruelsmith)
+- Replace deprecated `is_master` flag with `is_leader`. ([#57](https://github.com/Graylog2/puppet-graylog/issues/57))
+- Update default Graylog version to 5.1.
+- Disable `JAVA` setting in environment file by default. ([#60](https://github.com/Graylog2/puppet-graylog/issues/60))
+- Update PDK to 3.0.
+- Switch default MongoDB version to 5.0.19 in `graylog::allinone`.
+- Add `package_name` setting for `graylog::server`.
+- Remove java module requirement from documentation.
+- Replace Elasticsearch with OpenSearch in `graylog::allinone`.
+- Remove support for Graylog < 5.0.
 
 ## 1.0.0 (2021-10-25)
+
 - Add ability to update Java Heapsize. ([#47](https://github.com/Graylog2/puppet-graylog/issues/47))
-- Add ability to restart service on package upgrade. ([#48](https://github.com/Graylog2/puppet-graylog/issues/48)) @clxnetom
+- Add ability to restart service on package upgrade. ([#48](https://github.com/Graylog2/puppet-graylog/issues/48), @clxnetom)
 - Convert module to PDK. ([#33](https://github.com/Graylog2/puppet-graylog/issues/33))
 
 ## 0.9.1 (2021-10-21)
+
 - Update the module to use the latest version of Graylog. ([#44](https://github.com/Graylog2/puppet-graylog/issues/44))
   - Update Vagrant VMs used in test script.
   - Updated metadata.json to specify supported Puppet and OS versions. ([#33](https://github.com/Graylog2/puppet-graylog/issues/33))