Format upgrade merge (ocamlformat.0.6)

Merge done by Camelus based on opam-lib 2.0.0~rc

packages/ocamlformat/ocamlformat.0.6/opam

@@ -0,0 +1,28 @@
+opam-version: "2.0"
+maintainer: "OCamlFormat Team <ocamlformat-team@fb.com>"
+authors: "Josh Berdine <jjb@fb.com>"
+homepage: "https://github.com/ocaml-ppx/ocamlformat"
+bug-reports: "https://github.com/ocaml-ppx/ocamlformat/issues"
+dev-repo: "git+https://github.com/ocaml-ppx/ocamlformat.git"
+license: "MIT"
+build: [
+  ["tools/gen_version.sh" "src/Version.ml" version] {pinned}
+  ["jbuilder" "build" "-p" name "-j" jobs]
+]
+depends: [
+  "ocaml" {>= "4.04.1"}
+  "base" {>= "v0.11.0"}
+  "base-unix"
+  "cmdliner"
+  "jbuilder" {build & >= "1.0+beta20"}
+  "ocaml-migrate-parsetree" {>= "1.0.6"}
+  "ocamlformat_support" {>= "0.4" & < "0.5"}
+  "stdio"
+]
+synopsis: "Auto-formatter for OCaml code"
+description:
+  "OCamlFormat is a tool to automatically format OCaml code in a uniform style."
+url {
+  src: "https://github.com/ocaml-ppx/ocamlformat/archive/0.6.tar.gz"
+  checksum: "md5=73b1dea352fa121f5656d1fd651ad10d"
+}