upstream-extra: introduce ocveralls for coverage builds

The version appearing in the URL is 3.3.4, however this is the URL used
in the official opam repository, the hash is the correct one and the
content is the correct one.

Signed-off-by: Marcello Seri <[email protected]>

packages/upstream-extra/ocveralls.0.3.4/descr

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+Generate JSON for http://coveralls.io from bisect code coverage data.
+
+Also support automatic upload of generated data.

packages/upstream-extra/ocveralls.0.3.4/findlib

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+ocveralls

packages/upstream-extra/ocveralls.0.3.4/opam

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+opam-version: "1.2"
+available:    [ ocaml-version >= "4.02.0" ]
+name:         "ocveralls"
+version:      "0.3.4"
+maintainer:   "Julien Sagot [email protected]"
+author:       "Julien Sagot [email protected]"
+license:      "GPL v3.0"
+homepage:     "https://github.com/sagotch/ocveralls"
+bug-reports:  "https://github.com/sagotch/ocveralls/issues"
+dev-repo:     "https://github.com/sagotch/ocveralls.git"
+
+build:   [ make "build" ]
+install: [ make "bindir=%{bin}%" "install" ]
+remove:  [ "rm" "-f" "%{bin}%/ocveralls" ]
+
+depends: [
+  "ocamlfind" { build }
+  "ezjsonm" { build & >="0.4.0" }
+  ("bisect" | "bisect_ppx" { build })
+]

packages/upstream-extra/ocveralls.0.3.4/url

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+archive: "https://github.com/sagotch/ocveralls/archive/3.3.4.tar.gz"
+checksum: "5ba0aee3781c7c85e56f9525a56a182f"