Add the x-maintenance-intent entry for Mazeppa

Author: hirrolot

packages/mazeppa/mazeppa.0.6.0/opam

@@ -7,6 +7,7 @@ license: "Unlicense"
 homepage: "https://github.com/hirrolot/mazeppa"
 doc: "https://github.com/hirrolot/mazeppa"
 bug-reports: "https://github.com/hirrolot/mazeppa/issues"
+x-maintenance-intent: ["(latest)"]
 depends: [
   "ocaml" {>= "4.14"}
   "dune" {>= "3.14"}