Same visitors lower bound needed for Morbig < 0.11

Author: Niols

packages/morbig/morbig.0.10.3/opam

@@ -27,7 +27,7 @@ depends: [
   "ocaml"                {>= "4.04"}
   "odoc"                 {with-doc}
   "ppx_deriving_yojson"
-  "visitors"             {>= "20180513"}
+  "visitors"             {>= "20200207"}
   "yojson"               {< "2.0.0"}
 ]
 

packages/morbig/morbig.0.10.4/opam

@@ -27,7 +27,7 @@ depends: [
   "ocaml"                {>= "4.04"}
   "odoc"                 {with-doc}
   "ppx_deriving_yojson"
-  "visitors"             {>= "20180513"}
+  "visitors"             {>= "20200207"}
   "yojson"               {>= "1.6.0" & < "2.0.0"}
 ]