Deprecate Any#todo!

Signed-off-by: Alexandre Terrasa <[email protected]>

Author: Morriar

lib/rbs/types.rb

@@ -116,6 +116,7 @@ def to_s(level=0)
           @string || "untyped"
         end
 
+        # @deprecated: this method is now called from the constructor, do not call it from outside
         def todo!
           @string = '__todo__'
           self

sig/types.rbs

@@ -115,6 +115,7 @@ module RBS
 
         def initialize: (location: Location[bot, bot]?, ?todo: bool) -> void
 
+        %a{steep:deprecated}
         def todo!: () -> self
       end