Show Dart v2 support in index.md (#39)

Author: danini-the-panini

Diff for: src/index.md

@@ -122,7 +122,7 @@ of some examples of KDL in the wild (either v1, v2, or both):
 * C++ - [kdlpp](https://github.com/tjol/ckdl)\* (part of ckdl, requires C++20)
 * Common Lisp - [kdlcl](https://github.com/chee/kdlcl)
 * Crystal - [kdl-cr](https://github.com/danini-the-panini/kdl-cr)
-* Dart - [kdl-dart](https://github.com/danini-the-panini/kdl-dart)
+* Dart - [kdl-dart](https://github.com/danini-the-panini/kdl-dart)\*
 * Elixir - [kuddle](https://github.com/IceDragon200/kuddle)\*
 * Go -
   * [gokdl](https://github.com/lunjon/gokdl)