Not all sbws/*.ini files were making it into a source dist

MANIFEST.in

 include *.md
 include *.rst
+include sbws/*.ini
 recursive-include docs *
 prune docs/build
 recursive-include tests *
@@ -9,4 +10,4 @@ prune tests/testnets/*/datadir
 prune tests/testnets/*/exit?
 recursive-exclude tests/testnets/* config*.ini
 recursive-exclude tests/testnets/* *.log
-prune **/__pycache__
\ No newline at end of file
+prune **/__pycache__