Update the package publishing instructions

.pypirc

-[distutils]
-index-servers =
-  pypi
-  pypitest

doc/release-process.rst

@@ -58,12 +58,7 @@ Ensure that ``twine`` is installed:
 
    pip install twine
 
-Define the PyPI server(s) in ``.pypirc``:
-
-.. literalinclude:: ../.pypirc
-   :language: ini
-
-Build the wheel ``./dist/pypfilt-X.Y.Z-py2.py3-none-any.whl``:
+Build the wheel ``./dist/pypfilt-X.Y.Z-py3-none-any.whl``:
 
 .. code-block:: shell
 
@@ -74,7 +69,7 @@ Upload this wheel to the PyPI **test** server, so that any problems can be
 
 .. code-block:: shell
 
-   twine upload -r pypitest dist/pypfilt-X.Y.Z-py2.py3-none-any.whl
+   twine upload -r testpypi dist/pypfilt-X.Y.Z-py3-none-any.whl
 
 Then upload this wheel to PyPI: