add changelog to published documentation

Include the ChangeLog content in the published documentation to make it
possible to read without downloading the source. Add a link to the new
page to the readme for discoverability.

Change-Id: I3cc06846b6d84f5b175a33a48838c8a6a5e1771d
Closes-Bug: #1681725
Signed-off-by: Doug Hellmann <doug@doughellmann.com>

README.rst

@@ -34,6 +34,7 @@ them as quickly as possible.
 * Documentation: http://docs.openstack.org/developer/pbr
 * Source: http://git.openstack.org/cgit/openstack-dev/pbr
 * Bugs: http://bugs.launchpad.net/pbr
+* Change Log: https://docs.openstack.org/developer/pbr/history.html
 
 .. _d2to1: https://pypi.python.org/pypi/d2to1
 .. _distutils2: https://pypi.python.org/pypi/Distutils2

doc/source/history.rst

@@ -0,0 +1,5 @@
+=================
+ Release History
+=================
+
+.. include:: ../../ChangeLog

doc/source/index.rst

@@ -448,6 +448,7 @@ Additional Docs
    testing
    compatibility
    api/modules
+   history
 
 Indices and tables
 ==================