feat(deps): allow Sphinx 5/6/7 and sphinx-rtd-theme 2.x/3.x

Widen install_requires to sphinx>=4.5,<9 and sphinx_rtd_theme>=2.0,<4
so SpongeDocs can move past the docutils<0.18 pin that RTD-theme 1.0
carried. No template or CSS changes — the RTD-theme class names and
overridden blocks this theme hooks into are unchanged in the target
versions.

Bumps version to 1.2.0.

Signed-off-by: Gabriel Harris-Rouquette <gabizou@me.com>

Author: gabizou

CHANGELOG.md

@@ -0,0 +1,16 @@
+# Changelog
+
+## 1.2.0
+
+- Bump `install_requires` to `sphinx-rtd-theme>=2.0,<4` and `sphinx>=4.5,<9` so
+  the theme installs alongside modern Sphinx (5.x / 6.x / 7.x).
+  `sphinx-rtd-theme 1.0` pinned `docutils<0.18`, which blocked SpongeDocs from
+  upgrading past Sphinx 4.5.
+- No template or CSS changes. The RTD-theme 2.x/3.x class names this theme
+  hooks into (`wy-*`, `rst-versions`, `rst-current-version`, `rst-other-versions`,
+  `rst-footer-buttons`, `headerlink`) and the overridden block (`sidebartitle`)
+  are unchanged in the target versions.
+
+## 1.1.0 and earlier
+
+See Git history.

setup.py

@@ -10,7 +10,10 @@
     license='MIT',
 
     packages=['sponge_docs_theme'],
-    install_requires=['sphinx_rtd_theme==1.0.0'],
+    install_requires=[
+        'sphinx>=4.5,<9',
+        'sphinx_rtd_theme>=2.0,<4',
+    ],
 
     message_extractors={
         'src/theme/js': [

src/theme/__init__.py

@@ -1,4 +1,4 @@
-VERSION = (1, 1, 0)
+VERSION = (1, 2, 0)
 __version__ = '.'.join(str(v) for v in VERSION)