fix: python is python3.9

.readthedocs.yml

@@ -19,7 +19,7 @@ formats: all
 
 # Optionally set the version of Python and requirements required to build your docs
 python:
-  version: 3.8
+  version: 3.9
   install:
     - method: pip
       path: .

README.md

@@ -2,13 +2,12 @@
 
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