Add release notes page for version 0.13.0

Patrole 0.13.0 has been released and this
commit adds a new page for 0.13.0 release notes.

Change-Id: Ib4975ffdc37ca9b347d241b652a165c427ba3821
diff --git a/releasenotes/source/index.rst b/releasenotes/source/index.rst
index 9ef771a..a2893eb 100644
--- a/releasenotes/source/index.rst
+++ b/releasenotes/source/index.rst
@@ -6,6 +6,7 @@
    :maxdepth: 1
 
    unreleased
+   v0.13.0
    v0.12.0
    v0.11.0
    v0.10.0
diff --git a/releasenotes/source/v0.13.0.rst b/releasenotes/source/v0.13.0.rst
new file mode 100644
index 0000000..de69481
--- /dev/null
+++ b/releasenotes/source/v0.13.0.rst
@@ -0,0 +1,6 @@
+=====================
+v0.13.0 Release Notes
+=====================
+
+.. release-notes:: 0.13.0 Release Notes
+   :version: 0.13.0