Print y/n options when displaying prompts using cmdio.Ask (#650)

## Changes
Adds `[y/n]` in `cmdio.Ask` to make the options obvious in all question
prompts

## Tests
Test manually. Works.

bundle/deploy/files/delete.go

@@ -27,7 +27,7 @@ func (m *delete) Apply(ctx context.Context, b *bundle.Bundle) error {
 
 	red := color.New(color.FgRed).SprintFunc()
 	if !b.AutoApprove {
-		proceed, err := cmdio.Ask(ctx, fmt.Sprintf("\n%s and all files in it will be %s Proceed?: ", b.Config.Workspace.RootPath, red("deleted permanently!")))
+		proceed, err := cmdio.Ask(ctx, fmt.Sprintf("\n%s and all files in it will be %s Proceed?", b.Config.Workspace.RootPath, red("deleted permanently!")))
 		if err != nil {
 			return err
 		}

bundle/deploy/terraform/destroy.go

@@ -89,7 +89,7 @@ func (w *destroy) Apply(ctx context.Context, b *bundle.Bundle) error {
 	// Ask for confirmation, if needed
 	if !b.Plan.ConfirmApply {
 		red := color.New(color.FgRed).SprintFunc()
-		b.Plan.ConfirmApply, err = cmdio.Ask(ctx, fmt.Sprintf("\nThis will permanently %s resources! Proceed? [y/n]: ", red("destroy")))
+		b.Plan.ConfirmApply, err = cmdio.Ask(ctx, fmt.Sprintf("\nThis will permanently %s resources! Proceed?", red("destroy")))
 		if err != nil {
 			return err
 		}

libs/cmdio/logger.go

@@ -87,6 +87,8 @@ func (l *Logger) Ask(question string) (bool, error) {
 		return false, fmt.Errorf("question prompts are not supported in json mode")
 	}
 
+	// Add acceptable answers to the question prompt.
+	question += ` [y/n]:`
 	l.Writer.Write([]byte(question))
 	ans, err := l.Reader.ReadString('\n')