Add requirements file for Read the Docs

Cito · Cito · commit 88e2ef102155 · 2019-11-17T16:53:34.000+01:00
diff --git a/docs/requirements.txt b/docs/requirements.txt
@@ -0,0 +1,2 @@
+sphinx>=2.2,<3
+sphinx_rtd_theme>=0.4
