Update pyproject.toml

chrisjsewell · chrisjsewell · commit 953edb40af04 · 2022-04-15T02:04:39.000+02:00
diff --git a/pyproject.toml b/pyproject.toml
@@ -46,6 +46,7 @@ compare = [
 linkify = ["linkify-it-py~=1.0"]
 plugins = ["mdit-py-plugins"]
 rtd = [
+    "attrs",
     "myst-parser",
     "pyyaml",
     "sphinx",
