CHANGELOG: add v0.11.1 entry
CHANGELOG: add v0.11.1 entry

coreos/prometheus-operator,eedugon/prometheus-operator,gianrubio/prometheus-operator,mmerrill3/prometheus-operator,brancz/prometheus-operator,jescarri/prometheus-operator,mmerrill3/prometheus-operator,eedugon/prometheus-operator,brancz/prometheus-operator,jescarri/prometheus-operator,coreos/prometheus-operator,gianrubio/prometheus-operator,mmerrill3/prometheus-operator,gianrubio/prometheus-operator,brancz/prometheus-operator