Merge pull request graspnet#19 from graspnet/master

update rtd python version

Author: GouMinghao

.readthedocs.yml

@@ -21,7 +21,7 @@ formats:
   # Optionally set the version of Python and requirements required to build your docs
 
 python:
-  version: 3.8
+  version: 3.6
   install:
     - requirements: docs/requirements.txt
     - method: pip