add sphinx-rtd-theme to dev dependencies

diff --git a/pyproject.toml b/pyproject.toml
index 7ebefccc2d40e7e0d63494390bc51e021b012503..e209aacc3369b94f9f8449acd334f33a18bea6c6 100644 (file)
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -41,6 +41,7 @@ dev = [
     "pytest-cov>=4.1.0",
     "quart-trio>=0.11.0",
     "sphinx>=7.2.0",
+    "sphinx-rtd-theme>=2.0.0",
     "twine>=4.0.0",
     "wheel>=0.42.0",
 ]