Bump the openstackdocstheme extension to 1.20

Some options are now automatically configured by the version 1.20:
- project
- html_last_updated_fmt
- latex_engine
- latex_elements
- version
- release.

Change-Id: I34b5d91bb5eea3680d915a262bee4a24e2ae2752

doc/source/conf.py

@@ -44,7 +44,6 @@ copyright = u'2017, OpenStack Developers'
 repository_name = 'openstack/os-service-types'
 bug_project = '904'
 bug_tag = ''
-html_last_updated_fmt = '%Y-%m-%d %H:%M'
 
 # If true, '()' will be appended to :func: etc. cross-reference text.
 add_function_parentheses = True

releasenotes/source/conf.py

@@ -52,14 +52,12 @@ source_suffix = '.rst'
 master_doc = 'index'
 
 # General information about the project.
-project = u'os-service-types Release Notes'
 copyright = u'2017, OpenStack Developers'
 
 # openstackdocstheme options
 repository_name = 'openstack/os-service-types'
 bug_project = '904'
 bug_tag = ''
-html_last_updated_fmt = '%Y-%m-%d %H:%M'
 
 # The version info for the project you're documenting, acts as replacement for
 # |version| and |release|, also used in various other places throughout the
@@ -197,17 +195,6 @@ htmlhelp_basename = 'os_service_typesReleaseNotesdoc'
 
 # -- Options for LaTeX output ---------------------------------------------
 
-latex_elements = {
-    # The paper size ('letterpaper' or 'a4paper').
-    # 'papersize': 'letterpaper',
-
-    # The font size ('10pt', '11pt' or '12pt').
-    # 'pointsize': '10pt',
-
-    # Additional stuff for the LaTeX preamble.
-    # 'preamble': '',
-}
-
 # Grouping the document tree into LaTeX files. List of tuples
 # (source start file, target name, title,
 #  author, documentclass [howto, manual, or own class]).

test-requirements.txt

@@ -12,7 +12,7 @@ stestr>=2.0.0 # Apache-2.0
 oslotest>=3.2.0 # Apache-2.0
 testscenarios>=0.4 # Apache-2.0/BSD
 requests-mock>=1.2.0 # Apache-2.0
-openstackdocstheme>=1.18.1 # Apache-2.0
+openstackdocstheme>=1.20.0 # Apache-2.0
 keystoneauth1>=3.4.0 # Apache-2.0
 # releasenotes
 reno>=2.5.0 # Apache-2.0