Include requirements/default.txt in sdist
Fix FileNotFoundError: [Errno 2] No such file or directory: 'requirements\\default.txt'
@@ -2,3 +2,4 @@ include versioneer.py
include napari/_version.py
recursive-include napari/resources *.png *.jpeg *.jpg *.svg stylesheet.qss res.qrc
include napari/util/colormaps/matplotlib_cmaps.txt
+include requirements/default.txt
