Remove universal wheel bit since we're not universal now anymore.

setup.cfg

@@ -1,9 +1,3 @@
-[bdist_wheel]
-# This flag says that the code is written to work on both Python 2 and Python
-# 3. If at all possible, it is good practice to do this. If you cannot, you
-# will need to generate wheels for each Python version that you support.
-universal=1
-
 [metadata]
 license_file = LICENSE
 

setup.py

@@ -53,6 +53,7 @@ setup(
     packages=find_packages("src"),
     package_dir={"": "src"},
     include_package_data=True,
+    python_requires='>=3.7, <4',
     install_requires=[
         "dockerflow>=2018.4.0",
         "pgsanity",