Apply suggestions from code review

Author: mseri

packages/linol-eio/linol-eio.0.10/opam

@@ -15,7 +15,7 @@ depends: [
   "odoc" {with-doc}
 ]
 build: [
-  ["dune" "subst"] {pinned}
+  ["dune" "subst"] {dev}
   [
     "dune"
     "build"

packages/linol-lwt/linol-lwt.0.10/opam

@@ -14,7 +14,7 @@ depends: [
   "odoc" {with-doc}
 ]
 build: [
-  ["dune" "subst"] {pinned}
+  ["dune" "subst"] {dev}
   [
     "dune"
     "build"

packages/linol/linol.0.10/opam

@@ -16,7 +16,7 @@ depends: [
   "ppx_yojson_conv_lib" {>= "v0.14"}
 ]
 build: [
-  ["dune" "subst"] {pinned}
+  ["dune" "subst"] {dev}
   [
     "dune"
     "build"