fix: include dependency for librarytest (#218)

Author: dandhlee

tox.ini

@@ -27,6 +27,7 @@ commands =
 [testenv:librarytest]
 deps =
     sphinx_rtd_theme
+    {[testenv]deps}
 changedir = {toxinidir}/docs
 commands =
     sphinx-build -D extensions=sphinx.ext.autodoc,sphinx.ext.autosummary,docfx_yaml.extension,sphinx.ext.intersphinx,sphinx.ext.coverage,sphinx.ext.napoleon,sphinx.ext.todo,sphinx.ext.viewcode -b html -d {envtmpdir}/doctrees .  {envtmpdir}/html