added annotation to logger model
added annotation to logger model

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