setup.py: py <3.11

Just to be safe as some packages may not support 3.11 yet. Not sure
this field works at preventing python 3.11 installs though.

setup.py

@@ -27,7 +27,7 @@ def get_string(string, rel_path="src/accelerometer/__init__.py"):
 
 setuptools.setup(
     name="accelerometer",
-    python_requires=">=3.7",
+    python_requires=">=3.7, <3.11",
     version=versioneer.get_version(),
     cmdclass=versioneer.get_cmdclass(),
     description="A package to extract meaningful health information from large accelerometer datasets e.g. how much time individuals spend in sleep, sedentary behaviour, walking and moderate intensity physical activity",