Remove elixir 1 9 deprecations

[san650]

With elixir v1.9 there are warnings when updating structs using the struct name. e.g.

%User{user | name: "John Doe"} # deprecated in elixir v1.9

vs

%{user | name: "John Doe"}

This change is backward compatible with old elixir versions.

After

$ mix compile --force
Compiling 20 files (.ex)
Generated samly app

Before

$ mix compile --force

Compiling 20 files (.ex)
    warning: a struct for Samly.Assertion is expected on struct update:

        %Samly.Assertion{assertion | idp_id: idp_id}

    but got type:

        dynamic()

    where "assertion" was given the type:

        # type: dynamic()
        # from: lib/samly/sp_handler.ex:37:27
        {:ok, assertion} <- Samly.Helper.decode_idp_auth_resp(sp, saml_encoding, saml_response)

    when defining the variable "assertion", you must also pattern match on "%Samly.Assertion{}".

    hint: given pattern matching is enough to catch typing errors, you may optionally convert the struct update into a map update. For example, instead of:

        user = some_function()
        %User{user | name: "John Doe"}

    it is enough to write:

        %User{} = user = some_function()
        %{user | name: "John Doe"}

    typing violation found at:
    │
 39 │          assertion = %Assertion{assertion | idp_id: idp_id},
    │                      ~
    │
    └─ lib/samly/sp_handler.ex:39:22: Samly.SPHandler.consume_signin_response/1

     warning: a struct for Samly.IdpData is expected on struct update:

         %Samly.IdpData{idp_data | id: id, sp_id: sp_id, base_url: Map.get(opts_map, :base_url)}

     but got type:

         dynamic()

     where "idp_data" was given the type:

         # type: dynamic()
         # from: lib/samly/idp_data.ex:113:24
         idp_data

     when defining the variable "idp_data", you must also pattern match on "%Samly.IdpData{}".

     hint: given pattern matching is enough to catch typing errors, you may optionally convert the struct update into a map update. For example, instead of:

         user = some_function()
         %User{user | name: "John Doe"}

     it is enough to write:

         %User{} = user = some_function()
         %{user | name: "John Doe"}

     typing violation found at:
     │
 115 │     %IdpData{idp_data | id: id, sp_id: sp_id, base_url: Map.get(opts_map, :base_url)}
     │     ~
     │
     └─ lib/samly/idp_data.ex:115:5: Samly.IdpData.save_idp_config/2

     warning: a struct for Samly.IdpData is expected on struct update:

         %Samly.IdpData{idp_data | esaml_idp_rec: to_esaml_idp_metadata(idp_data, opts_map)}

     but got type:

         dynamic()

     where "idp_data" was given the type:

         # type: dynamic()
         # from: lib/samly/idp_data.ex:156:26
         idp_data

     when defining the variable "idp_data", you must also pattern match on "%Samly.IdpData{}".

     hint: given pattern matching is enough to catch typing errors, you may optionally convert the struct update into a map update. For example, instead of:

         user = some_function()
         %User{user | name: "John Doe"}

     it is enough to write:

         %User{} = user = some_function()
         %{user | name: "John Doe"}

     typing violation found at:
     │
 159 │         idp_data = %IdpData{idp_data | esaml_idp_rec: to_esaml_idp_metadata(idp_data, opts_map)}
     │                    ~
     │
     └─ lib/samly/idp_data.ex:159:20: Samly.IdpData.update_esaml_recs/3

     warning: a struct for Samly.IdpData is expected on struct update:

         %Samly.IdpData{
           idp_data
           | entity_id: get_entity_id(md_xml),
             signed_requests: get_req_signed(md_xml),
             certs: signing_certs,
             fingerprints: idp_cert_fingerprints(signing_certs),
             sso_redirect_url: get_sso_redirect_url(md_xml),
             sso_post_url: get_sso_post_url(md_xml),
             slo_redirect_url: get_slo_redirect_url(md_xml),
             slo_post_url: get_slo_post_url(md_xml),
             nameid_format: get_nameid_format(md_xml)
         }

     but got type:

         dynamic()

     where "idp_data" was given the type:

         # type: dynamic()
         # from: lib/samly/idp_data.ex:263:31
         idp_data

     when defining the variable "idp_data", you must also pattern match on "%Samly.IdpData{}".

     hint: given pattern matching is enough to catch typing errors, you may optionally convert the struct update into a map update. For example, instead of:

         user = some_function()
         %User{user | name: "John Doe"}

     it is enough to write:

         %User{} = user = some_function()
         %{user | name: "John Doe"}

     typing violation found at:
     │
 274 │     %IdpData{
     │     ~
     │
     └─ lib/samly/idp_data.ex:274:5: Samly.IdpData.from_xml/2

Generated samly app

[san650]

@k-cross do you know if this project is still being maintained? I saw that you merged the lasts few PRs.