says that it needs a recent dune (#1025)

ggreif · trefis · commit b090fe2b0582 · 2019-09-23T09:40:51.000+01:00
diff --git a/README.md b/README.md
@@ -24,7 +24,7 @@ Manually building and installing Merlin
 Compilation
 -----------
 
-Dependencies: ocaml >= 4.02.3, ocamlfind, yojson, dune.
+Dependencies: ocaml >= 4.02.3, ocamlfind, yojson, dune >= 1.8.
 
 ```shell
 dune build -p merlin
