Depend on dune 3.16

We depend on a feature newer than 3.14.2 and it works for 3.16.

bin/push.ml

@@ -36,7 +36,7 @@ let specification =
   [
     ("--message", Arg.Set_string message, "The commit message")
   ; ("--email", Arg.Set_string email, "The email used to craft the commit")
-  ; ("-r", Arg.Set_string remote, "The Git repository")
+  ; ("-r", Arg.Set_string remote, "The Git repository including #branch, e.g. " ^ !remote)
   ; ("--author", Arg.Set_string author, "The Git commit author")
   ; ("--host", Arg.Set_string host, "The host where the blog is available")
   ]

blogger.opam

@@ -19,7 +19,7 @@ bug-reports: "https://github.com/dinosaure/blogger/issues"
 
 depends: [
   "ocaml" { >= "5.1.0" }
-  "dune" { >= "2.8" }
+  "dune" { >= "3.16.0" }
   "preface" { >= "0.1.0" }
   "logs" {>= "0.7.0" }
   "cmdliner" { >= "1.0.0"}

dune-project

@@ -1,2 +1,2 @@
-(lang dune 2.8)
+(lang dune 3.16)
 (name blogger)