Drop OCaml 4.04 for ppxlib. Migrate from Travis to GitHub Actions.

.github/workflows/workflow.yml

@@ -0,0 +1,45 @@
+name: Main workflow
+
+on:
+  - pull_request
+  - push
+
+jobs:
+  build:
+    strategy:
+      fail-fast: false
+      matrix:
+        os:
+          - macos-latest
+          - ubuntu-latest
+          - windows-latest
+        ocaml-version:
+          - 4.12.0
+          - 4.11.2
+          - 4.10.2
+          - 4.09.1
+          - 4.08.1
+          - 4.07.1
+          - 4.06.1
+          - 4.05.0
+
+    runs-on: ${{ matrix.os }}
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+
+      - name: Use OCaml ${{ matrix.ocaml-version }}
+        uses: avsm/setup-ocaml@v1
+        with:
+          ocaml-version: ${{ matrix.ocaml-version }}
+
+      - run: opam pin add ppx_deriving_cmdliner.dev . --no-action
+
+      - run: opam depext ppx_deriving_cmdliner --yes --with-test
+
+      - run: opam install . --deps-only --with-test
+
+      - run: opam exec -- dune build
+
+      - run: opam exec -- dune runtest

README.md

@@ -6,6 +6,8 @@ It is also a [ppx_deriving](https://github.com/whitequark/ppx_deriving) plugin
 that generates a [Cmdliner](https://github.com/dbuenzli/cmdliner) `Term` for a
 given type.
 
+![example workflow](https://github.com/hammerlab/ppx_deriving_cmdliner/actions/workflows/workflow.yml/badge.svg)
+
 ## Example
 
 

dune-workspace.dev

@@ -1,10 +1,10 @@
 (lang dune 1.0)
 ;; This file is used by `make all-supported-ocaml-versions`
-(context (opam (switch 4.04.0)))
+(context (opam (switch 4.12.0)))
+(context (opam (switch 4.11.2)))
+(context (opam (switch 4.10.2)))
+(context (opam (switch 4.09.1)))
+(context (opam (switch 4.08.1)))
+(context (opam (switch 4.07.1)))
+(context (opam (switch 4.06.1)))
 (context (opam (switch 4.05.0)))
-(context (opam (switch 4.06.0)))
-(context (opam (switch 4.07.0)))
-(context (opam (switch 4.08.0)))
-(context (opam (switch 4.09.0)))
-(context (opam (switch 4.10.0)))
-(context (opam (switch 4.11.0)))

ppx_deriving_cmdliner.opam

@@ -22,7 +22,7 @@ run-test: [
   ["dune" "runtest" "-p" name "-j" jobs]
 ]
 depends: [
-  "ocaml"        {>= "4.03"}
+  "ocaml"        {>= "4.05"}
   "cmdliner"     {>= "1.0.0"}
   "result"
   "ppx_deriving" {>= "5.0"}