removed test and updated ProtocolBuffer.readString() method

Author: Tarek

cloudnet-lib/src/main/java/de/dytanic/cloudnet/lib/network/protocol/ProtocolBuffer.java

@@ -124,8 +124,12 @@ public void writeString(String write)
 
     public String readString()
     {
-        long integer = readVarLong();
-        return byteBuf.readBytes((int) integer).toString(StandardCharsets.UTF_8);
+        int integer = (int) readVarLong();
+
+        byte[] buffer = new byte[integer];
+        byteBuf.readBytes(buffer, 0, integer);
+
+        return new String(buffer, StandardCharsets.UTF_8);
     }
 
     @Override