Remove reference to `ui.pleasantProgress`
Remove reference to `ui.pleasantProgress`

Ember-cli [removed `pleasantProgress` on `UI` in v2.4.3](https://github.com/ember-cli/ember-cli/pull/5612/files#diff-862010a5cfb735a85ea8db20df2b584fR35). The `startProgress`/`stopProgress` methods should be used instead (they are present at least as far back as v0.2.7 of ember-cli).
LevelbossMike/ember-deploy-s3,LevelbossMike/ember-deploy-s3