minor: Update components list in README.md

Author: HugoGGuerrier

README.md

@@ -7,15 +7,12 @@ The syntax is not stable for now.
 
 ## High level overview
 
-[`lkql/`](lkql): Contains:
-* Langkit language definition for the LKQL parser
-* Implementation of the LKQL interpreter (in
-  [`lkql/extensions/src`](lkql/extensions/src)). Embedding the LKQL interpreter
-  only requires using the `lkql` project.
-* Command line app for the interpreter
-
-[`lkql_checker`](lkql_checker): LKQL command line checker. Can run "checks"
-    that will flag specific lines of code in a given Ada codebase.
+[`lkql/`](lkql): Langkit language definition for the LKQL parser.
+
+[`lkql_checker/`](lkql_checker): GNATcheck sources and predefined LKQL rules.
+
+[`lkql_jit/`](lkql_jit): LKQL reference implementation using the Truffle Java
+   framework.
 
 ## Building & using