namely('alias') throws exception if not referenced once? #85

From your example in the Readme (on the namely('alias') section)

If "self" reference is replaced in the parser it throws an error on compiling
=> Uncaught TypeError: Cannot set property 'resolved' of undefined

Example:
// the line below registers the name 'self', so we will be able to use it in // twoCells` as a reference
var parser = Parser.start().namely("self");

var stop = Parser.start().namely("stop");

var twoCells = Parser.start()
.namely("twoCells")
.nest("left", { type: "self" })
.nest("right", { type: "stop" });

parser.uint8("type").choice("data", {
tag: "type",
choices: {
0: "stop", // !!! replaced "self" with "stop"
1: "stop",
2: "twoCells"
}
});

var buffer = Buffer.from([2, /* left / 1, 1, 0, / right */ 0]);

parser.parse(buffer);`