docs/requirements.txt: add typing_extensions

pip-compile doesn't support environment markers..
fonttools · Apr 29, 2020 · b4a88ff · b4a88ff
1 parent 5df38b8
commit b4a88ff
Showing 1 changed file with 1 addition and 0 deletions.
diff --git a/docs/requirements.txt b/docs/requirements.txt
@@ -1,3 +1,4 @@
 -r ../requirements.txt
+typing_extensions; python_version < '3.8'
 sphinx>3
 sphinx_rtd_theme