Update installation command in Readme
Update installation command in Readme

jeffreybiles/ember-cli-form-data,funtusov/ember-cli-form-data,jeffreybiles/ember-cli-form-data,jsalva/ember-cli-form-data,GabKlein/ember-cli-form-data,GabKlein/ember-cli-form-data,funtusov/ember-cli-form-data,jsalva/ember-cli-form-data