Convert the hello world example to a release

examples/hello_world/src/hello_world.erl

@@ -1,15 +0,0 @@
-%% Feel free to use, reuse and abuse the code in this file.
-
--module(hello_world).
-
-%% API.
--export([start/0]).
-
-%% API.
-
-start() ->
-	ok = application:start(crypto),
-	ok = application:start(cowlib),
-	ok = application:start(ranch),
-	ok = application:start(cowboy),
-	ok = application:start(hello_world).

examples/hello_world/src/toppage_handler.erl

@@ -7,11 +7,13 @@
 -export([handle/2]).
 -export([terminate/3]).
 
-init(_Transport, Req, []) ->
+init(_Type, Req, []) ->
 	{ok, Req, undefined}.
 
 handle(Req, State) ->
-	{ok, Req2} = cowboy_req:reply(200, [], <<"Hello world!">>, Req),
+	{ok, Req2} = cowboy_req:reply(200, [
+		{<<"content-type">>, <<"text/plain">>}
+	], <<"Hello world!">>, Req),
 	{ok, Req2, State}.
 
 terminate(_Reason, _Req, _State) ->