More than one reader cause errors

[mrcheidel]

Hi, I'm trying to have more that one reader on the same queue and when I start the second reader, it fail:

reader.js code:

const FileQueue = require("fileq");

var queue = FileQueue.from("queue", {"path": __dirname });
var i=0;

setInterval(()=>{
	queue.peek((err,entry)=>{
		console.log(entry);
	});
},100);

Then try to run this code in 2 separated terminals as "node reader.js" ...
The first one run ok, but the second response with the below

Error:

/node_modules/levelup/lib/levelup.js:119
      return callback(new OpenError(err))
                      ^
Error [OpenError]: IO error: lock //queue/LOCK: Resource temporarily unavailable
    at //node_modules/levelup/lib/levelup.js:119:23
    at //node_modules/abstract-leveldown/abstract-leveldown.js:38:14
    at //node_modules/deferred-leveldown/deferred-leveldown.js:31:21
    at //node_modules/abstract-leveldown/abstract-leveldown.js:38:14
Emitted 'error' event on LevelUP instance at:
    at //node_modules/levelup/lib/levelup.js:60:19
    at //node_modules/levelup/lib/levelup.js:119:14
    at //node_modules/abstract-leveldown/abstract-leveldown.js:38:14
    at //node_modules/deferred-leveldown/deferred-leveldown.js:31:21
    at //node_modules/abstract-leveldown/abstract-leveldown.js:38:14