possibly fix rtd (#504)

escapewindow · web-flow · commit 2ca5039957d2 · 2021-05-20T17:43:00.000-07:00
diff --git a/pyproject.toml b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.black]
 line-length = 160
-target-version = ["py37", "py38"]
+target-version = ["py37", "py38", "py39"]
 include = '\.(wsgi|pyi?)$'
 exclude = '''
 /(
diff --git a/readthedocs.yml b/readthedocs.yml
@@ -2,5 +2,5 @@ requirements_file: requirements-docs.txt
 build:
     image: latest
 python:
-    version: 3.6
+    version: 3.8
     setup_py_install: true
