Accept absolute URI scheme as uppercase

We should be doing a case insensitive comparison to be correct,
but this is more expensive. Almost all clients send lowercase,
this patch fixes handling of the aws/aws-sdk-php client which
sends uppercase, and no known client sends mixed case so I am
holding back on the more expensive solution for the moment.

src/cowboy_protocol.erl

@@ -180,6 +180,10 @@ parse_uri(<< "http://", Rest/bits >>, State, Method) ->
 	parse_uri_skip_host(Rest, State, Method);
 parse_uri(<< "https://", Rest/bits >>, State, Method) ->
 	parse_uri_skip_host(Rest, State, Method);
+parse_uri(<< "HTTP://", Rest/bits >>, State, Method) ->
+	parse_uri_skip_host(Rest, State, Method);
+parse_uri(<< "HTTPS://", Rest/bits >>, State, Method) ->
+	parse_uri_skip_host(Rest, State, Method);
 parse_uri(Buffer, State, Method) ->
 	parse_uri_path(Buffer, State, Method, <<>>).