dev: Remove MANIFEST.in
dev: Remove MANIFEST.in

The only file we list, LICENSE, is included in the sdist regardless of
MANIFEST.in, thanks to setuptools_scm. Furthermore, bdist_wheel ignores
MANIFEST.in:
https://packaging.python.org/tutorials/distributing-packages/#manifest-in

Fixes #90.

CameronTEllis/brainiak,IntelPNI/brainiak,mihaic/brainiak,mihaic/brainiak,TuKo/brainiak,CameronTEllis/brainiak,mihaic/brainiak,yidawang/brainiak,lcnature/brainiak,CameronTEllis/brainiak,brainiak/brainiak,brainiak/brainiak,brainiak/brainiak,IntelPNI/brainiak,TuKo/brainiak,yidawang/brainiak,IntelPNI/brainiak,TuKo/brainiak,yidawang/brainiak,lcnature/brainiak,lcnature/brainiak