fix type definition

Author: icewind1991

src/Parser/Packet/Parser.ts

@@ -2,5 +2,5 @@ import {Packet} from "../../Data/Packet";
 import {BitStream} from 'bit-buffer';
 import {Match} from "../../Data/Match";
 
-export type Parser = (stream: BitStream, match?: Match, skip: boolean = false) => Packet;
+export type Parser = (stream: BitStream, match?: Match, skip?: boolean) => Packet;
 export type PacketParserMap = {[id: number]: Parser};