Allow one items.

Author: Eric-Guo

app/components/primer/alpha/segmented_control.rb

@@ -60,8 +60,8 @@ def initialize(hide_labels: HIDE_LABELS_DEFAULT, full_width: FULL_WIDTH_DEFAULT,
       end
 
       def render?
-        valid_items_count = items.count <= (@hide_labels ? 6 : 5) && items.count >= 2
-        raise ArgumentError, "A segmented control should have 2–5 choices with text labels, or up to 6 icon-only buttons." if !valid_items_count && !Rails.env.production?
+        valid_items_count = items.count <= (@hide_labels ? 6 : 5) && items.count >= 1
+        raise ArgumentError, "A segmented control should have 1–5 choices with text labels, or up to 6 icon-only buttons." if !valid_items_count && !Rails.env.production?
 
         valid_items_count
       end