use the main dev requirements for rtd

Thomas Bird · Thomas Bird · commit 7d77aa119018 · 2020-09-10T19:21:24.000+01:00
diff --git a/.readthedocs.yml b/.readthedocs.yml
@@ -13,4 +13,4 @@ sphinx:
 python:
   version: 3.8
   install:
-    - requirements: docs/requirements.txt
+    - requirements: requirements/python-dev
diff --git a/docs/requirements.txt b/docs/requirements.txt
diff --git a/requirements/python-dev b/requirements/python-dev
@@ -1,5 +1,4 @@
-# install everything in the python requirements too. this may be
-# needed by readthedocs?!?!
+# install everything in the python requirements too.
 -r python
 
 # needed for tests/run.py script to read .travis.yml file
