update manifest for sdist
MODIFY
.gitignore
.gitignore
@@ -5,5 +5,6 @@ build
*.egg-info
*.py[co]
__pycache__
+MANIFEST
repo2docker/s2i

ADD
MANIFEST.in
+exclude repo2docker/s2i
+include Dockerfile
+include *.md
+include LICENSE
+include setup.cfg
+
+graft s2i-builders

update manifest for sdist