include spake2.parameters when building the dist/sdist

Author: warner

setup.py

@@ -65,7 +65,7 @@ def abbrev(t):
       author_email="warner-pyspake2@lothar.com",
       url="https://github.com/warner/python-spake2",
       package_dir={"": "src"},
-      packages=["spake2", "spake2.test"],
+      packages=["spake2", "spake2.parameters", "spake2.test"],
       license="MIT",
       cmdclass=cmdclass,
       classifiers=[