Add constraint on Merlin to Gopcaml

Author: voodoos

packages/gopcaml-mode/gopcaml-mode.0.0.6/opam

@@ -15,7 +15,7 @@ depends: [
   "ppx_deriving" {>= "4.4.0"}
   "ecaml" {>= "v0.15.0"}
   "ocaml-migrate-parsetree" {>= "2.4.0"}
-  "merlin" {>= "2.5.0"}
+  "merlin" {>= "2.5.0" < "4.8"}
   "ocp-indent" {>= "1.0.0"}
 ]
 build: [