Merge pull request #1633 from PyCQA/py37-plus

require python>=3.7

docs/source/conf.py

@@ -14,6 +14,8 @@
 # add these directories to sys.path here. If the directory is relative to the
 # documentation root, use os.path.abspath to make it absolute, like shown here.
 # sys.path.insert(0, os.path.abspath('.'))
+from __future__ import annotations
+
 import flake8
 
 # -- General configuration ------------------------------------------------