Add v0.2.0 releasenotes page

This is to add a v0.2.0 releasenotes page as Patrole 0.2.0 was
released during the penultimate cycle so this is overdue.

Change-Id: Icc4628de816b9a413a5d7fdf44cc98c3d651f840
diff --git a/releasenotes/source/index.rst b/releasenotes/source/index.rst
index 11e1ac4..8c90aae 100644
--- a/releasenotes/source/index.rst
+++ b/releasenotes/source/index.rst
@@ -1,9 +1,10 @@
-======================
- Patrole Release Notes
-======================
+=====================
+Patrole Release Notes
+=====================
 
 .. toctree::
    :maxdepth: 1
 
    unreleased
+   v0.2.0
    v0.1.0