Update subliminal to 2.0.5

Also updates:
- appdirs-1.4.3
- babelfish-0.5.5
- beautifulsoup4-4.6.3
- certifi-2018.11.29
- chardet-3.0.4
- click-7.0
- decorator-4.3.0
- dogpile.cache-0.7.1
- enzyme-0.4.1
- guessit-3.0.3
- idna-2.8
- pbr-5.1.1
- pysrt-1.1.1
- python-dateutil-2.7.5
- pytz-2018.7
- rarfile-3.0
- rebulk-1.0.0
- requests-2.21.0
- six-1.12.0
- stevedore-1.30.0
- urllib3-1.24.1

libs/pbr/hooks/backwards.py

@@ -0,0 +1,33 @@
+# Copyright 2013 Hewlett-Packard Development Company, L.P.
+# All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+
+from pbr.hooks import base
+from pbr import packaging
+
+
+class BackwardsCompatConfig(base.BaseConfig):
+
+    section = 'backwards_compat'
+
+    def hook(self):
+        self.config['include_package_data'] = 'True'
+        packaging.append_text_list(
+            self.config, 'dependency_links',
+            packaging.parse_dependency_links())
+        packaging.append_text_list(
+            self.config, 'tests_require',
+            packaging.parse_requirements(
+                packaging.TEST_REQUIREMENTS_FILES,
+                strip_markers=True))