Fix readthedocs config format key (2nd attempt)

dmacvicar · dmacvicar · commit c611c1dce50e · 2019-10-09T17:07:25.000+02:00
diff --git a/.readthedocs.yml b/.readthedocs.yml
@@ -10,8 +10,7 @@ sphinx:
   configuration: docs/conf.py
 
 # Optionally build your docs in additional formats such as PDF and ePub
-formats:
-  - html
+formats: all
 
 # Optionally set the version of Python and requirements required to build your docs
 python:
