include stonesense changelog in generated unified changelog

docs/dev/Documentation.rst

@@ -498,6 +498,8 @@ changelogs are combined as part of the changelog build process:
 * ``docs/changelog.txt`` for changes in the main ``dfhack`` repo
 * ``scripts/changelog.txt`` for changes made to scripts in the ``scripts`` repo
 * ``library/xml/changelog.txt`` for changes made in the ``df-structures`` repo
+* ``plugins/stonesense/changelog.txt`` for changes made in the ``stonesense``
+  repo
 
 Building the changelogs generates two files: ``docs/changelogs/news.rst`` and
 ``docs/changelogs/news-dev.rst``. These correspond to `changelog` and

docs/sphinx_extensions/dfhack/changelog.py

@@ -2,7 +2,6 @@
 import copy
 import itertools
 import os
-import sys
 
 from sphinx.errors import ExtensionError, SphinxError, SphinxWarning
 
@@ -12,6 +11,7 @@
     'docs/changelog.txt',
     'scripts/changelog.txt',
     'library/xml/changelog.txt',
+    'plugins/stonesense/changelog.txt',
 )
 CHANGELOG_PATHS = (os.path.join(DFHACK_ROOT, p) for p in CHANGELOG_PATHS)