Update README

README.md

@@ -4,12 +4,15 @@ Fiat − Deductive Synthesis of Abstract Data Types in a Proof Assistant
 This repository holds the source code of Fiat, a Coq ADT synthesis
 library.
 
+This library is now mostly unmaintained; only targets `fiat-core parsers
+parsers-examples` are maintained for Coq's CI.
+
 ## Dependencies:
-  * To build the library:          Coq 8.4pl6
+  * To build the library:          Coq 8.4pl6 (use branch [v8.4](https://github.com/mit-plv/fiat/tree/v8.4)), Coq >= 8.16 (only `fiat-core parsers parsers-examples`)
   * To step through the examples:  GNU Emacs 24.3+, Proof General 4.4+
   * To extract and run OCaml code: OCaml 4.02.0+
 
 ## Compiling and running the code
   * To build the core library: `make fiat-core`
-  * To build the SQL-like libary: `make querystructures`
+  * To build the SQL-like libary: `make querystructures` (no longer builds)
   * To build the parsers libary: `make parsers`