Remove the TODO item about converting to Typed Racket.

Yay, done!  2 (?) years of work.

README.org

@@ -36,46 +36,6 @@ interaction with Org-mode.
    that I work on the subsequent items decreases with their position
    in the list.
 
-*** TODO Convert =dds= to Typed Racket
-    Rewriting =dds= with Typed Racket will be a major refactoring,
-    consisting in the following 3 phases which will happen more or
-    less in parallel:
-
-    - define types, add type signatures, add types for functions
-      I import from =graph=;
-    - transfer the comments from the source files to Scribble
-      documentation;
-    - redefine the generic interface for dynamics, which is currently
-      in =generics=.
-
-    I plan to implement the new dynamics as a structure, from which
-    all the concrete dynamics of the objects will inherit.  This will
-    hopefully work like interface inheritance.  The current plan is to
-    start converting =networks= to Typed Racket, then starting the new
-    module =dynamics= to fill in the blanks progressively by moving
-    over bits of code from =generics=.  The goal is to have an empty
- =generics= module at the end.
-
-    People on Racket Users suggested using structures with fields
-    containing functions, but it does not seem to get me to my goal of
-    having type-level methods/functions.
-
-    The order in which I will convert the modules:
-
-    1. =utils=,
-    2. =functions=,
-    3. =networks= and =dynamics= (currently =generics=) at the same
-       time,
-    4. =networks=,
-    5. =rs=.
-
-    I will convert the modules one by one by first creating a typed
-    section (a submodule) and re-exporting its functions together with
-    the untyped functions.  I will then move the functions one by one
-    from the untyped section to the typed section.  When the untyped
-    section is empty, I will convert the language of the entire module
-    to Typed Racket and remove the submodule.
-
 *** TODO Remove the artifacts of conversion to Typed Racket
     Since I am converting =dds= to Typed Racket gradually, I need to
     leave a couple artifacts to ensure that older code compiles with