skiboot-5.6.0 release notes

Signed-off-by: Stewart Smith <[email protected]>

doc/release-notes/skiboot-5.6.0.rst

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+.. _skiboot-5.6.0:
+
+skiboot-5.6.0
+=============
+
+skiboot-5.6.0 was released on Wednesday 24th May 2017. It is the new stable
+release of skiboot, taking over from the 5.5 release, first released on
+April 7th 2017. It is the first release done in a regular six week release
+cycle, mirroring that of op-build.
+
+skiboot-5.6.0 contains all bug fixes as of :ref:`skiboot-5.4.4`
+and :ref:`skiboot-5.1.19` (the currently maintained stable releases). We
+do not currently expect to do any 5.5.x stable releases.
+
+For how the skiboot stable releases work, see :ref:`stable-rules` for details.
+
+This release is a good level set of POWER9 support for bringup activities.
+If you are doing bringup, it is strongly suggested you continue to follow
+skiboot master.
+
+Changes in skiboot-5.6.0
+------------------------
+
+See changes in the release candidates:
+
+- :ref:`skiboot-5.6.0-rc1`
+- :ref:`skiboot-5.6.0-rc2`
+
+The final 5.6.0 release has no functional changes over the 5.6.0-rc2.
+