Tidy MANIFEST.in

[k-collie]

A lot of the files listed there aren't present in the repository. Some e.g. VERSION aren't used. Some are included by default.

It could probably be cut down to:

recursive-include idlbridge *.py *.pyx *.pxd *.pxi

Resources:

• https://setuptools.pypa.io/en/latest/userguide/miscellaneous.html
• https://setuptools.pypa.io/en/latest/userguide/ext_modules.html#distributing-extensions-compiled-with-cython