simplify package by putting the main function in __init__.py. No need for...

simplify package by putting the main function in __init__.py. No need for anything more complicated for such a simple example

pak/__init__.py

-from .hello import hello
-
+def main():
+    return "Hello, World!"
\ No newline at end of file

pak/hello.py

-def hello():
-    return "Hello, World!"
\ No newline at end of file