remove shebangs in .py files

Author: guilgautier

src/packagename/__init__.py

@@ -1,3 +1 @@
-#!/usr/bin/env python3
-# coding=utf-8
-# __init__.py is required to mark the directory as a Python module
+"""Required to mark the directory as a Python package."""

src/packagename/operations.py

@@ -1,14 +1,10 @@
-#!/usr/bin/env python3
-# coding=utf-8
-
-
 def addition(x, y):
-    """Compute ``x + y``, i.e., the result of the addition
+    """Compute the addition ``x + y``.
 
     .. math::
         :label: eq:my-addition
 
-        x + y
+        x + y.
 
     Args:
         x (number): First number

tests/test_addition.py

@@ -1,6 +1,3 @@
-#!/usr/bin/env python3
-# coding=utf-8
-
 import pytest
 
 from packagename.operations import addition