support OTP 23 and modify only applications for spec

rebar.config

@@ -2,7 +2,7 @@
 
 %% accept R15B02.., any R16B except R16B03
 %% also accept OTP v17, altough it may not work properly on that release yet..
-{require_otp_vsn, "R16B$|R16B[^0]|R16B0[^3]|R16B03-1|17|18|19|20|21|22"}.
+{require_otp_vsn, "R16B$|R16B[^0]|R16B0[^3]|R16B03-1|17|18|19|20|21|22|23"}.
 
 {erl_opts, [debug_info]}.
 {yrl_opts, [{includefile, "include/erlydtl_preparser.hrl"}]}.

src/erlydtl.app.src.script

@@ -4,11 +4,7 @@ ExtraApps = case application:get_key(syntax_tools, vsn) of
                 {ok, Vsn} when "1.7" > Vsn -> [merl];
                 _ -> []
             end,
-
-[{application, erlydtl,
- [{description, "Django Template Language for Erlang"},
-  {vsn, git},
-  {modules, []},
-  {applications, [kernel, stdlib, compiler, syntax_tools|ExtraApps]},
-  {registered, []}
- ]}].
+Apps = [kernel, stdlib, compiler, syntax_tools | ExtraApps],
+[{application, erlydtl, Spec}] = CONFIG,
+NewSpec = lists:keystore(applications, 1, Spec, {applications, Apps}),
+[{application, erlydtl, NewSpec}].