Fix version number and release date in notes

Author: davehunt

CHANGES.rst

@@ -1,14 +1,14 @@
 Release Notes
 -------------
 
-**1.20.9 (2019-01-12)**
+**1.20.0 (2019-01-14)**
 
 * Tests running with Pytest 4.0 and Python 3.7
 
 * Stop filtering out falsy environment values (`#175 <https://github.com/pytest-dev/pytest-html/issues/175>`_)
 
-    * Thanks to `@jknotts <https://github.com/jknotts>`_ for reporting the issue 
-      and to `@crazymerlyn <http://github.com/crazymerlyn>`_ for providing a fix
+  * Thanks to `@jknotts <https://github.com/jknotts>`_ for reporting the issue
+    and to `@crazymerlyn <http://github.com/crazymerlyn>`_ for providing a fix
 
 * Removed extraneous space from anchor tag (`@chardbury <https://github.com/chardbury>`_)