add warning to 0.11.0 release notes
add warning to 0.11.0 release notes

eHealthAfrica/rapidsms,eHealthAfrica/rapidsms,eHealthAfrica/rapidsms,ehealthafrica-ci/rapidsms,ehealthafrica-ci/rapidsms,catalpainternational/rapidsms,lsgunth/rapidsms,peterayeni/rapidsms,catalpainternational/rapidsms,catalpainternational/rapidsms,peterayeni/rapidsms,ehealthafrica-ci/rapidsms,caktus/rapidsms,caktus/rapidsms,lsgunth/rapidsms,lsgunth/rapidsms,peterayeni/rapidsms,caktus/rapidsms,catalpainternational/rapidsms,lsgunth/rapidsms,peterayeni/rapidsms