Minimum required ocaml version 4.07 required by base

Author: andersfugmann

.github/workflows/workflow.yml

@@ -32,17 +32,17 @@ jobs:
       - run: opam exec -- dune runtest
 
   compat:
-    name: compat (ubuntu-latest, 4.04.0)
+    name: compat (ubuntu-latest, 4.07.0)
     runs-on: ubuntu-latest
 
     steps:
      - name: Checkout code
        uses: actions/checkout@v2
 
-     - name: Use OCaml 4.04.0
+     - name: Use OCaml 4.07.0
        uses: avsm/setup-ocaml@v1
        with:
-         ocaml-version: 4.04.0
+         ocaml-version: 4.07.0
 
      - run: opam pin . --no-action
      - run: opam install . --deps-only

ppx_protocol_conv.opam

@@ -10,7 +10,7 @@ build: [
   ["dune" "runtest" "-p" name "-j" jobs] {with-test}
 ]
 depends: [
-  "ocaml" {>= "4.04"}
+  "ocaml" {>= "4.07"}
   "base" {>= "v0.14.0" }
   "dune" {>= "1.2"}
   "ppxlib" {>= "0.9.0"}