Modernized build tooling

src/boilerplate/__main__.py

@@ -1,13 +1,5 @@
-"""
-Entrypoint module, in case you use `python -mboilerplate`.
+"""Entry point for python -m boilerplate."""
 
-
-Why does this file exist, and why __main__? For more info, read:
-
-- https://www.python.org/dev/peps/pep-0338/
-- https://docs.python.org/2/using/cmdline.html#cmdoption-m
-- https://docs.python.org/3/using/cmdline.html#cmdoption-m
-"""
 from boilerplate.cli import main
 
 if __name__ == "__main__":