Fix readthedocs setup for Py3.8

Author: pcisar

.readthedocs.yml

@@ -0,0 +1,17 @@
+# .readthedocs.yml
+# Read the Docs configuration file
+# See https://docs.readthedocs.io/en/stable/config-file/v2.html for details
+
+# Required
+version: 2
+
+# Build documentation in the docs/ directory with Sphinx
+sphinx:
+    configuration: docs/conf.py
+
+
+# Optionally set the version of Python and requirements required to build your docs
+python:
+    version: 3.8
+    install:
+        - requirements: docs/requirements.txt