docs: update roadmap in README and add Tangled URL to Mix package

Author: Ovyerus

README.md

@@ -9,8 +9,8 @@ Elixir.
 - [x] TID codecs
 - [x] XRPC client
 - [x] DID & handle resolution service with a cache
-- [ ] Structs with validation for the common lexicons
-  - [ ] Probably codegen for doing this with other lexicons
+- [x] Macro for converting a Lexicon definition into a runtime-validation schema
+  - [ ] Codegen to convert a directory of lexicons
 - [ ] Extended XRPC client with support for validated inputs/outputs
 - [ ] Oauth stuff
 

mix.exs

@@ -2,7 +2,8 @@ defmodule Atex.MixProject do
   use Mix.Project
 
   @version "0.3.0"
-  @source_url "https://github.com/cometsh/atex"
+  @github "https://github.com/cometsh/atex"
+  @tangled "https://tangled.sh/@comet.sh/atex"
 
   def project do
     [
@@ -41,7 +42,7 @@ defmodule Atex.MixProject do
   defp package do
     [
       licenses: ["MIT"],
-      links: %{"GitHub" => @source_url}
+      links: %{"GitHub" => @github, "Tangled" => @tangled}
     ]
   end
 
@@ -52,7 +53,7 @@ defmodule Atex.MixProject do
         "README.md": [title: "Overview"]
       ],
       main: "readme",
-      source_url: @source_url,
+      source_url: @github,
       source_ref: "v#{@version}",
       formatters: ["html"]
     ]