fixing sphinx version

shailesh1729 · shailesh1729 · commit 694df30d5dbe · 2021-07-12T21:03:09.000+05:30
diff --git a/docs/requirements.txt b/docs/requirements.txt
@@ -7,7 +7,7 @@ scipy
 matplotlib
 imageio
 click
-sphinx>=3.3.0
+sphinx=4.0.0
 sphinx_rtd_theme>=0.5.0
 sphinxcontrib-katex>=0.7.1
 sphinxcontrib-bibtex>=1.0.0
