fixup! add comment about progress terminal detection

bib/internal/progress/progress.go

@@ -39,6 +39,9 @@ func New(progress string) ProgressBar {
 	case "", "null":
 		return NewNullProgressBar()
 	case "text":
+		// XXX: this needs to fallback to non-pb if not on a
+		// terminal, pb Start() will error and Stop() will hang
+		// otherwise
 		return NewTermProgressBar()
 	case "debug":
 		return NewDebugProgressBar()