Remove trailing slash in MANIFEST, which was preventing pip install on windows machines.
Remove trailing slash in MANIFEST, which was preventing pip install on
windows machines.

rapidsms/rapidsms-core-dev,catalpainternational/rapidsms,ken-muturi/rapidsms,lsgunth/rapidsms,caktus/rapidsms,caktus/rapidsms,lsgunth/rapidsms,dimagi/rapidsms,catalpainternational/rapidsms,ehealthafrica-ci/rapidsms,unicefuganda/edtrac,unicefuganda/edtrac,peterayeni/rapidsms,unicefuganda/edtrac,ken-muturi/rapidsms,lsgunth/rapidsms,lsgunth/rapidsms,peterayeni/rapidsms,ken-muturi/rapidsms,peterayeni/rapidsms,ehealthafrica-ci/rapidsms,eHealthAfrica/rapidsms,dimagi/rapidsms,catalpainternational/rapidsms,eHealthAfrica/rapidsms,peterayeni/rapidsms,ehealthafrica-ci/rapidsms,eHealthAfrica/rapidsms,rapidsms/rapidsms-core-dev,catalpainternational/rapidsms,caktus/rapidsms