Merge pull request #174 from cisagov/improvement/add-lower-bound-for-setuptools

Add lower bound for `setuptools`

Author: jsf9k

pyproject.toml

@@ -3,7 +3,17 @@
 # https://setuptools.pypa.io/en/latest/userguide/pyproject_config.html
 [build-system]
 build-backend = "setuptools.build_meta"
-requires = ["setuptools"]
+requires = [
+    # 61.0.0 was the first version of setuptools to offer a full-fledged
+    # backend that uses pyproject.toml for metadata configuration (in
+    # compliance with PEP 621):
+    # https://setuptools.pypa.io/en/stable/history.html#v61-0-0
+    #
+    # 77.0.0 was the first version of setuptools to support license
+    # expressions (in compliance with PEP 639):
+    # https://setuptools.pypa.io/en/stable/history.html#v77-0-0
+    "setuptools>=77.0.0"
+]
 
 [project]
 authors = [