Update change log and add release notes

Documentation/Changelog.md

@@ -28,6 +28,7 @@
   the master. There is also limited capability for rejoining nodes.
 
 For more details, please refer to:
+* [MariaDB MaxScale 2.2.8 Release Notes](Release-Notes/MaxScale-2.2.8-Release-Notes.md)
 * [MariaDB MaxScale 2.2.7 Release Notes](Release-Notes/MaxScale-2.2.7-Release-Notes.md)
 * [MariaDB MaxScale 2.2.6 Release Notes](Release-Notes/MaxScale-2.2.6-Release-Notes.md)
 * [MariaDB MaxScale 2.2.5 Release Notes](Release-Notes/MaxScale-2.2.5-Release-Notes.md)

Documentation/Release-Notes/MaxScale-2.2.8-Release-Notes.md

@@ -0,0 +1,34 @@
+# MariaDB MaxScale 2.2.8 Release Notes -- 2018-06
+
+Release 2.2.8 is a GA release.
+
+This document describes the changes in release 2.2.8, when compared to
+release 2.2.7.
+
+For any problems you encounter, please consider submitting a bug
+report at [Jira](https://jira.mariadb.org).
+
+## Bug fixes
+
+* [MXS-1889](https://jira.mariadb.org/browse/MXS-1889) A single remaining master is valid for readconnroute configured with 'router_options=slave'
+* [MXS-1740](https://jira.mariadb.org/browse/MXS-1740) Hintfilter leaks memory
+
+## Known Issues and Limitations
+
+There are some limitations and known issues within this version of MaxScale.
+For more information, please refer to the [Limitations](../About/Limitations.md) document.
+
+## Packaging
+
+RPM and Debian packages are provided for the Linux distributions supported
+by MariaDB Enterprise.
+
+Packages can be downloaded [here](https://mariadb.com/downloads/mariadb-tx/maxscale).
+
+## Source Code
+
+The source code of MaxScale is tagged at GitHub with a tag, which is identical
+with the version of MaxScale. For instance, the tag of version X.Y.Z of MaxScale
+is X.Y.Z. Further, *master* always refers to the latest released non-beta version.
+
+The source code is available [here](https://github.com/mariadb-corporation/MaxScale).