Fixed sdist package for psycopg3-c

`types` made into a package so that the setup.py is able to find the
Cython sources there.

diff --git a/psycopg3_c/psycopg3_c/types/__init__.py b/psycopg3_c/psycopg3_c/types/__init__.py
new file mode 100644 (file)
index 0000000..e69de29