Clean up MANIFEST.in

For the most common use cases, setuptools will automatically
find out which files are necessary for distributing the package.
The following files are included in a source distribution by default:
- All files specified by the license-files configuration parameter
  in pyproject.toml; note that if you don’t explicitly set this
  parameter, setuptools will include any files that match the
  following glob patterns: LICEN[CS]E*, COPYING*, NOTICE*, AUTHORS**;
- pyproject.toml;
- README, README.txt, README.rst or README.md;
- MANIFEST.in

https://setuptools.pypa.io/en/latest/userguide/miscellaneous.html

Author: DimitriPapadopoulos

MANIFEST.in

@@ -11,9 +11,7 @@ recursive-include distributed *.yaml
 recursive-include docs *.rst
 recursive-exclude distributed **/tests/*
 
-include README.rst
 include LICENSE.txt
-include MANIFEST.in
 include distributed/py.typed
 exclude distributed/pytest_resourceleaks.py