+ppx_deriving.1.0
+ppx_deriving_yojson.2.0
+ppx_deriving_protobuf.2.0
Fix opam/url typos.
Merge pull request #2883 from whitequark/ppx_deriving.1.0

+ppx_deriving.1.0 +ppx_deriving_yojson.2.0 +ppx_deriving_protobuf.2.0