tweaks

csst_proto/some_other_modules.py

 def some_arbitrary_functions():
     """ an arbitrary function """
-    return
+    print("Hi, this is an arbitrary function.")

requirements.txt

@@ -4,3 +4,5 @@ joblib~=1.1.0
 setuptools~=58.0.4
 astropy~=5.1
 pytest
+coverage
+pycodestyle~=2.8.0
\ No newline at end of file