config file for RTD
MODIFY
docs/doc-requirements.txt
docs/doc-requirements.txt
-mne
-graphviz
-pygraphviz
sphinx>=1.4, !=1.5.4
jupyter_alabaster_theme
recommonmark

ADD
readthedocs.yml
+name: repo2docker
+type: sphinx
+python:
+ version: 3
+requirements_file: doc/doc-requirements.txt

config file for RTD