Fix API in README
Fix API in README

ciena-frost/ember-frost-bunsen,sandersky/ember-frost-bunsen,sophypal/ember-frost-bunsen,sandersky/ember-frost-bunsen,sophypal/ember-frost-bunsen,ciena-frost/ember-frost-bunsen,sophypal/ember-frost-bunsen,sandersky/ember-frost-bunsen,ciena-frost/ember-frost-bunsen