Fix duplicated type property

Fixes #4

Author: duncte123

protocol/src/main/java/me/duncte123/lyrics/model/Lyrics.java

@@ -1,9 +1,8 @@
 package me.duncte123.lyrics.model;
 
 import com.fasterxml.jackson.annotation.JsonSubTypes;
-import com.fasterxml.jackson.annotation.JsonTypeInfo;
 
-@JsonTypeInfo(use=JsonTypeInfo.Id.NAME, include=JsonTypeInfo.As.PROPERTY, property="type")
+// @JsonTypeInfo(use=JsonTypeInfo.Id.NAME, include=JsonTypeInfo.As.PROPERTY, property="type")
 @JsonSubTypes({
         @JsonSubTypes.Type(name="text", value=TextLyrics.class),
         @JsonSubTypes.Type(name="timed", value=TimedLyrics.class)