Can't run on node 4.1.1

[aiguofer]

Hey! this sounds awesome! especially for exploring APIs and such. Unfortunately, I can't get it to on Arch, on what I gather are the latest available versions.

$npm -g list choir
/usr/lib
`-- [email protected]

$node --version
v4.1.1
$choir
/usr/lib/node_modules/choir/lib/magic/run_magic.js:122
let sglobal = sandbox;
^^^

SyntaxError: Block-scoped declarations (let, const, function, class) not yet supported outside strict mode
at exports.runInThisContext (vm.js:53:16)
at Module._compile (module.js:413:25)
at Module._extensions..js (module.js:452:10)
at Object.require.extensions.(anonymous function) as .js
at Module.load (module.js:355:32)
at Function.Module._load (module.js:310:12)
at Module.require (module.js:365:17)
at require (module.js:384:17)
at Object. (/usr/lib/node_modules/choir/lib/choir_server.js:10:17)
at Module._compile (module.js:434:26)