eliom.6.13.1: Fix constraints (js_of_ocaml-ppx_deriving_json only supports the 4.08 only feature since 3.6.0, ppx_tools only supports 4.08 since 5.2, lwt_ppx supports 4.08 features only since 1.2.3 and uses ppx_tools_versioned.metaquot_408)
eliom.6.13.1: Fix constraints (js_of_ocaml-ppx_deriving_json only supports the 4.08 only feature since 3.6.0, ppx_tools only supports 4.08 since 5.2, lwt_ppx supports 4.08 features only since 1.2.3 and uses ppx_tools_versioned.metaquot_408)

emillon/opam-repository,jonludlam/opam-repository,Leonidas-from-XIV/opam-repository,pirbo/opam-repository,jhwoodyatt/opam-repository,c-cube/opam-repository,lefessan/opam-repository,jhwoodyatt/opam-repository,pqwy/opam-repository,Leonidas-from-XIV/opam-repository,kkirstein/opam-repository,codinuum/opam-repository,nberth/opam-repository,seliopou/opam-repository,kkirstein/opam-repository,Chris00/opam-repository,lefessan/opam-repository,toots/opam-repository,astrada/opam-repository,mjambon/opam-repository,Chris00/opam-repository,seliopou/opam-repository,jonludlam/opam-repository,yallop/opam-repository,ocaml/opam-repository,c-cube/opam-repository,djs55/opam-repository,toots/opam-repository,djs55/opam-repository,emillon/opam-repository,hannesm/opam-repository,mjambon/opam-repository,ocaml/opam-repository,yallop/opam-repository,pqwy/opam-repository,andersfugmann/opam-repository,fpottier/opam-repository,fpottier/opam-repository,nberth/opam-repository,codinuum/opam-repository,hannesm/opam-repository,pirbo/opam-repository,andersfugmann/opam-repository,astrada/opam-repository