Instead of clearing the screen for each new frame, simply scroll the …

…new frame to the top of the terminal viewport. This keeps all past frames present and scrollable into view by scrolling up.

Resolves #5.

lib/prompts/content.rb

@@ -64,7 +64,7 @@ def jump_cursor_to_top
     end
 
     def erase_down
-      OUTPUT.print "\e[J"
+      OUTPUT.print "\e[2J\e[H"
     end
   end
 end