Correct a warning in MANIFEST.in

felixonmars · felixonmars · commit 088b560ae785 · 2021-08-13T00:25:18.000+08:00
```
warning: manifest_maker: MANIFEST.in, line 7: 'recursive-include' expects &lt;dir&gt; &lt;pattern1&gt; &lt;pattern2&gt; ...
```
diff --git a/MANIFEST.in b/MANIFEST.in
@@ -4,6 +4,5 @@ graft test
 graft visualizer
 graft examples
 prune docs/build
-recursive-include *.py
 include README.rst LICENSE CHANGELOG.rst CONTRIBUTORS.rst tox.ini
 global-exclude *.pyc *.pyo *.swo *.swp *.map *.yml *.DS_Store
