Add some plans for the future

README.md

@@ -172,3 +172,7 @@ Here is a table to show which traits you should derive, depending on your enum:
 There are also `ScribeString` and `TryScribeString` traits which can be used in the same situations as `ScribeCowStr` and `TryScribeCowStr`, respectively.
 These traits produce a `String` rather than a `Cow<'static, str>`, so they will always perform an allocation. Therefore, you should prefer the
 `ScribeCowStr` traits over the `ScribeString` traits, unless you *really* don't want to use a `Cow` for whatever reason.
+
+## Plans for the future
+- [ ] Converting to / from types other than strings
+- [ ] Unix-permissions-style encoding for collections of enum variants