Fix Yocaml packages (prior to 1.0.x)

Author: xvw

packages/yocaml/yocaml.1.0.0/opam

@@ -22,7 +22,7 @@ depends: [
   "dune" { >= "2.8" }
   "odoc" {with-doc}
   "alcotest" {with-test}
-  "preface" { >= "1.0.0"}
+  "preface" { = "1.0.0"}
 ]
 conflicts: [
   "ocaml-variants" {= "4.12.0+domains+effects" | = "5.1.1+effect-syntax"}

packages/yocaml_cmark/yocaml_cmark.1.0.0/opam

@@ -23,7 +23,7 @@ depends: [
   "ocaml" { >= "4.14.0" }
   "dune" { >= "2.8" }
   "odoc" {with-doc}
-  "preface" { >= "1.0.0" }
+  "preface" { = "1.0.0" }
   "cmarkit"
   "yocaml" {= version}
 ]

packages/yocaml_git/yocaml_git.1.0.0/opam

@@ -23,7 +23,7 @@ depends: [
   "ocaml" { >= "4.11.1" }
   "dune" { >= "2.8" }
   "odoc" {with-doc}
-  "preface" { >= "1.0.0" }
+  "preface" { = "1.0.0" }
   "lwt" { >= "5.4.2" }
   "git-kv" { >= "0.0.3" }
   "git-unix"

packages/yocaml_jingoo/yocaml_jingoo.1.0.0/opam

@@ -23,7 +23,7 @@ depends: [
   "ocaml" { >= "4.11.1" }
   "dune" { >= "2.8" }
   "odoc" {with-doc}
-  "preface" { >= "1.0.0"}
+  "preface" { = "1.0.0"}
   "jingoo" { >= "1.4.3" }
   "yocaml" {= version}
 ]

packages/yocaml_markdown/yocaml_markdown.1.0.0/opam

@@ -23,7 +23,7 @@ depends: [
   "ocaml" { >= "4.11.1" }
   "dune" { >= "2.8" }
   "odoc" {with-doc}
-  "preface" { >= "1.0.0" }
+  "preface" { = "1.0.0" }
   "omd" { >= "1.3.1" }
   "yocaml" {= version}
 ]

packages/yocaml_mustache/yocaml_mustache.1.0.0/opam

@@ -23,7 +23,7 @@ depends: [
   "ocaml" { >= "4.11.1" }
   "dune" { >= "2.8" }
   "odoc" {with-doc}
-  "preface" { >= "1.0.0" }
+  "preface" { = "1.0.0" }
   "mustache" { >= "3.1.0" }
   "yocaml" {= version}
 ]

packages/yocaml_unix/yocaml_unix.1.0.0/opam

@@ -23,7 +23,7 @@ depends: [
   "ocaml" { >= "4.11.1" }
   "dune" { >= "2.8" }
   "odoc" {with-doc}
-  "preface" { >= "1.0.0" }
+  "preface" { = "1.0.0" }
   "cryptokit" { >= "1.16.1" }
   "logs" {>= "0.7.0" }
   "conduit-lwt" { >= "4.0.0" }

packages/yocaml_yaml/yocaml_yaml.1.0.0/opam

@@ -23,7 +23,7 @@ depends: [
   "ocaml" { >= "4.11.1" & < "5.3"}
   "dune" { >= "2.8" }
   "odoc" {with-doc}
-  "preface" { >= "1.0.0" }
+  "preface" { = "1.0.0" }
   "yaml" { >= "2.1.0" }
   "yocaml" {= version}
   "alcotest" {with-test}